Regular readers of this blog will know that lentils are my favorite legume. I adored my grandmother Angelina’s pasta e lenticchie as a kid, and I still love just about anything made with lentils, including of course soup.
Zuppa di lenticchie or lentil soup is a winter standby in Italian home cookery, but zuppa di lenticchie e porri is unusual in that it doesn’t start with the typical soffritto (flavor base) of onion, garlic or the ‘holy trinity’ of onions, carrots and celery. Instead, this soup features leeks, another classic winter vegetable, which lends the savor of other alliums along with its uniquely sweet and delicate taste.
Leeks aren’t the most typical of Italian vegetables, but leek dishes do show up in Italian cookery, in particular in Tuscan cookery as in the lovely torta di porri (a leek tart) and zuppa di porri (leek soup), though the renowned porri di Cervere from nearby Piemonte region take the prize for the best leeks in the peninsula.
And the leeks here aren’t merely a flavor base. They’re a co-equal partner. Both lentils and leeks are cooked separately, then simmered together just long enough for their flavors to meld, ensuring that each retains its own individual character. It’s a “marriage” made in heaven. The sweet, delicate taste of the leeks provides a delicious contrast and complement to the earthiness of the lentils.
And not only that: zuppa di lenticchie e porri is an easy soup, and fairly quickly put together. Although the recipe involves a few steps, the actual active cooking time is perhaps 30 minutes top, making it a fine choice for a warming weeknight supper.
Ingredients
Serves 4-6
- 400 g (14 oz) lentils
- 1-2 cloves of garlic, slightly crushed and peeled
- A sprig of fresh parsley
- Salt, to taste
For the soup:
- 100g (3-1/2 oz) pancetta, diced*
- 4-5 small to medium sized leeks
- Broth, preferably homemade meat* or vegetable broth, or water, if needed
- Olive oil
- Salt and pepper
- A sprig of fresh rosemary (optional)
Optional toppings:
- Freshly grated parmgiano-reggiano, q.b.*
- Olive oil
* Omit these ingredients for a vegetarian/vegan dish
Directions
Prep and cook the lentils
Optionally, set the lentils in a large bowl covered with water by at least 8cm (3 in). Soak overnight (or at least two hours).
In a large pot, place the lentils, along with the garlic and parsley. Cover with water by at least 3cm (1 in). Simmer until barely tender. (Cooking times vary wildly depending on variety of the lentils and whether they’re pre-soaked. See Notes below for details.) Add water as needed to keep the lentils covered. When they’re done, turn off the heat, add salt to taste and let rest for at least 5 minutes. Pick out and remove the garlic and parsley.
Prep and cook the leeks
Meanwhile, prep the leeks by trimming off their dark green tops, then cut them down the middle lengthwise, and if thick again into quarters. If you see any grit, then rinse the leeks thoroughly, drain them and let them dry. Cut the leeks horizontally into large dice.
In a large saucepan, saucier or braiser, sauté the diced pancetta in olive oil over gentle heat until it’s rendered its fat and just begun to brown. Then add the diced leeks and a small pinch of salt and simmer until they are quite soft and well reduced, usually around 15-20 minutes. Add a few drops of water from time to time to help the leeks along and prevent them from browning.
Putting the soup together
When the leeks are very tender, add the lentils, drained of their cooking water, to the pot. Stir the lentils into the leeks and let them simmer together for 5 minutes or so, turning from time to time.
Add enough broth or water (or the cooking liquid from the lentils) to the pot to cover the lentils and leeks entirely, along with the rosemary if using. Simmer everything together for another 5-10 minutes or so.
If you like a thicker soup (and I often do) crush some of the lentils with a wooden spoon or spatula against the side of the pot as they simmer, as many as you need to get the consistency you prefer. Conversely, if the soup is too thick for your taste, add more liquid. At the end of cooking, taste and adjust for seasoning.
Serve hot, topped if you like with a drizzle of olive oil or a dusting of freshly grated parmigiano-reggiano, or both.
Notes
You can make zuppa di lenticchie e porri with any kind of lentil, but generally speaking you want brown or green lentils. In Italy the lentils of choice are the small green lenticchie di Castelluccio from the Umbria region. They have very tender skins so will be perfectly tender after 30-40 minutes of cooking without pre-soaking. They are hard to find here in the US, though they are sometimes available online. You can find other lentils imported from Italy, usually from Umbria like these from gustiamo.com easily, but not for whatever reason the famous ones from Castelluccio. Go figure… That said, the excellent Le Puy lentils are much easier to source and work perfectly in this soup. And honestly, any good quality lentils will do fine. Since this is a soup, they don’t even need to hold their shape, though I still prefer it if they do.
Cooking times for lentils can vary enormously. Generally speaking, lentils take a lot less time to cook than they used to. The green lentils I used for this soup took only 15 minutes after an overnight soak. Unsoaked lentils usually take anywhere from 25 to 45 minutes, depending on the variety and how old they are, although some can take as much as 60 minutes should do. So check the package to be sure. And test their doneness after 15 or 20 minutes to get a sense of how fast they’re cooking.
To soak or not to soak?
Many varieties of lentils these days don’t need soaking, especially if they’re smaller and tender-skinned like Castelluccios or Le Puys. That said, I still soak lentils if I have the time and foresight. Since they’re quicker to cook, I find pre-soaked lentils hold their shape better. And they just plain have finer taste and texture. Pre-soaked lentils are less likely to cause gas, if that’s a problem for you, and some sources like this one and this one—especially out of India where, of course, lentils are a staple—say they’re more nutritious as well.
An overnight soak is ideal for most legumes, but for lentils even two hours will do some good. You can also “speed soak” lentils and other legumes by bringing to a boil, then turn off the heat and covering them. Let me rest for about 30 minutes for lentils, an hour for most other legumes. That said, if you’ve forgotten to soak, or just don’t want to bother, you can just go ahead and simmer your lentils for a bit longer.
Choosing and prepping your leeks
As for the leeks, as mentioned at the top, the famed Cervere leeks would be your top choice. They are especially sleek and tender, with an exquisitely sweet and delicate taste. Outside Italy, just look for the best looking leeks you can find. The size of leeks can vary enormously. For me, I prefer to use smallest, slenderest leeks if I can find. They are more tender and, to my mind, have a finer flavor. But here again, use what you can find. As the old saying goes, don’t let the best be the enemy of the good.
Leeks these days are often sold with little or no grit, but do check and if you see the slightest trace of grit, rinse them well. It’s always better to be safe than sorry.
The dark green tops aren’t used in the dish, but no need to throw them away. Add them to your next batch of broth. They lend wonderful flavor.
Variations
As mentioned at the top, this is a fairly unusual recipe for zuppa di lenticchie. More typical of Italian lentil soup recipes is a flavor base of onion, or onion and garlic, or the usual “holy trinity” of onion, carrot and celery. Sometimes, especially in southern Italian recipes, a tomato or two goes into the post as well. And the estimable Jeanne Caròla Francesconi has a very simple recipe for a Neapolitan style zuppa di lenticchie where you boil lentils until tender in a large pot, adding a garlic clove, a few chopped tomatoes, olive oil and a dash of salt directly to the pot along the way.
Otherwise, the recipe for zuppa di lenticchie e porri provides lots of room for variations. If you want to veganize the recipe, just omit the pancetta and use vegetable broth or water. If you want to lean into the alliums, you can add a sliced onion or garlic to simmer along with the leeks. Instead of rosemary, sage would work nicely.
Or you can mix things up by adding a few potatoes or some winter squash, peeled and diced, or some mushrooms, thinly sliced and sautéed in garlic and oil, to the final simmer. Or a few tomatoes to simmer along with the leeks for color.
As for toppings, in addition to the classic ones mentioned in the recipe above, bread croutons (fried or air fried in olive oil) would be lovely for an even more stick to the ribs dish. Or a grinding of black pepper to add some spice.
If you want to save yourself cleaning an extra pot, you can always add uncooked lentils (in this case, preferably pre-soaked) directly to the leeks, then simmer everything together until the lentils are tender. This works perfectly fine but the longer cooking time means that the leeks do tend to “disappear” into the soup. They will still lend their lovely flavor but lose their individuality.
Making ahead
It scarcely needs saying, but this soup can be made ahead with excellent results. In fact, like a lot of legume dishes, I find it’s even tastier if it’s had an overnight rest.
Zuppa di lenticchie e porri
Ingredients
- 400g 14 oz lentils preferably brown or green
- 1-2 cloves garlic slightly crushed and peeled
- A sprig of fresh parsley
- Salt to taste
For the soup
Optional toppings
- Freshly grated parmigiano-reggiano
- Olive oil
Instructions
Prep and cook the lentils
- Optionally, set the lentils in a large bowl covered with water by at least 8cm (3 in). Soak overnight (or at least two hours).
- In a large pot, place the lentils, along with the garlic and bay leaf. Cover with water by at least 3cm (1 in). Simmer until barely tender. Add water as needed to keep the lentils covered. When they're done, turn off the heat, add salt to taste and let rest for at least 5 minutes.
Prep and cook the leeks
- Meanwhile, prep the leeks by trimming off their dark green tops, then cut them down the middle lengthwise, and if thick again into quarters. If you see any grit, then rinse the leeks thoroughly, drain them and let them dry. Cut the leeks horizontally into large dice.
- In a large saucepan, saucier or braiser, sauté the diced pancetta in olive oil over gentle heat until it's rendered its fat and just begun to brown. Then add the diced leeks and a small pinch of salt and simmer until they are quite soft and well reduced, usually around 15-20 minutes. Add a few drops of water from time to time to help the leeks along and prevent them from browning.
Putting the soup together
- When the leeks are very tender, add the lentils, drained of their cooking water, to the pot. Stir the lentils into the leeks and let them simmer together for a few minutes, tossing from time to time.
- Add enough cooking liquid from the lentils to the pot to cover the lentils and leeks entirely, along with the rosemary if using. Simmer everything together for another 5-10 minutes or so.
- If you like a thicker soup (and I often do) crush some of the lentils with a wooden spoon or spatula against the side of the pot as they simmer, as many as you need to get the consistency you prefer. Conversely, if the soup is too thick for your taste, add more liquid, either the cooking liquid from the lentils, broth or water. At the end of cooking, taste and adjust for seasoning.
- Serve hot, topped if you like with a drizzle of olive oil or a dusting of freshly grated parmigiano-reggiano, or both.
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36 Comments on “Zuppa di lenticchie e porri (Lentil and Leek Soup)”
Hello Frank!
Would you only use the white part of the leeks for this recipe? If I were to use the whole leek, I could probably halve the number of leeks needed?
Ps. You seem to have omitted something at the end of the first paragraph of the Variations (after mentioning the Francesconi recipe). Something very delicious, I presume 🙂
And I imagine “The sweet, delicate taste of the leeks provides a delicious contrast and complement to the earthiness of the leeks” should have “lentils” as the last word 🙂
Yes, only the white part. I mention trimming off the dark green tops in the instructions but perhaps I should make it clearer that the tops aren’t used in the dish. I added that to the notes. And yes, thanks for the heads up. In all honesty I can’t remember what I had there in the first paragraph but it was one of the variations that I mention later on in the notes.
I added half a salt-preserved lemon, chopped fine, to the soup – very good. It brightened and lifted the flavor. BTW, I LOVE lentil soup and really like your leek addition!
Thanks so much, Elisabeth.
I am getting ready to make this soup but have a question…. you have parsley in the recipe to cook with the lentils but in the directions you mention taking out the bay leaf instead of the parlsey… did you just forget to list the bay leaf?
Oops! You’re right. I changed my mind at the last minute and went with parsley rather than bay leaf to flavor the lentils, then forgot to change that particular reference. That said, if you’d like to throw in a bay leaf as well, feel free. I just thought the taste would be too emphatic for the effect I was going for.
We had every plann to make this today (it’s Saint David’s Day, and we always have leeks on Saint David’s Day), but I have a beautiful piece of tuna in the fridge so we are having that for dinner tonight and this soup tomorrow. David won’t mind. I hope you don’t!
TIL thanks to you I found about Saint David, Wales and leeks… My hat’s off to you. I thought we were the only ones in North American who celebrate name days! 😉
I love my name day — much prefer it to my birthday! The soup was really wonderful, Frank. The first bite transported us both to Italy — that flavor could be from nowhere else. Next up — the stuffed cabbage you just posted.
I love how you’ve highlighted the unique sweetness and delicate flavor of leeks in this traditional Italian soup. It’s refreshing to see a twist on the classic lentil soup, with leeks taking center stage alongside the earthy lentils. I love it
Thanks, Raymund! I love it, too.. 😉
Lentils are my favorite legume, too (still need to try pasta with lentil ragu – seen recipe on your blog!) So this soup is calling my name; so hearty and delicious!
Great minds think alike, Ben! Hope you like it…
This does sound like an easy (and different!) soup for these chilly days. We’re always looking for new soup inspiration this time of the year. For some reason, we don’t use lentils all that often around here. Clearly this soup is a good reason to rediscover them! And I love the addition of Parmesan at the end.
Glad you liked the recipe, David! Do give it a try, I think you’d enjoy it.
Thanks for the recipe Frank. I had never cooked with leeks before and am always looking for new recipes for lentil soup so I cooked it tonight and it’s very good. Thanks!
Delighted to hear it, Denio!
I do love lentils and cook with them often so I’ll be happy to try your recipe. I’ve never soaked the lentils but will try your method next time.
It’s worth a try if you have time, Eva. That said, I often forget to do it myself, lol!
Mmmmmm. I love that the soup and the leeks are cooked separately! That’s a good move. Beautiful recipe.
Thanks, Mimi!
I love lentils, my husband doesn’t. What a dilemma? Your soup looks fantastic, full of flavor and filling.
Thanks, Gerlinde! And sorry to hear about your dilemma! I love lentils so much I can’t imagine how someone couldn’t like them!
So simple and I bet it tastes delicious!
It does… 😉
Lentils are so good! Good for you and filling and can be so tasty. So many different types too.
Indeed! We should all be thankful for them. 🙂
Childhood memories flood my brain, lentil soup probably being the most common form of sustenance put in front of one. With all the choice available here and now must remember to have it on the menu once cooler weather returns. Love leeks tho’ ours Down Under must be way larger than what is usual for you. A couple would suffice here methinks . . . soon, soon . . .
Nothing is quite like lentil soup as comfort food, is it? Yes if you have very large leeks, I’d reduce the amount accordingly. Though for this recipe, as I mention the leeks are meant to be more than just a flavor base so do use more than you might think.
The soup sounds and looks so comforting! I wish I could enjoy more legumes without 2nd thought..my tummy hates them.
Thanks, Angie. Sorry about that. I adore legumes and can’t imagine going without. Do you have those issues even after soaking them? They say soaking does help to make legumes more digestible…
Thank you so much for those links on the health benefits of soaking and cooking lentils. Very recently purchased a large amount of them and planned to use them soon.
Now off by to soak those lentils…
Good luck, Carol!
I made the soup yesterday with the notorious kale, which is added to virtually every soup I make. It doesn’t add any strong flavour at all, just a lot of health benefits and a nice colour and texture.
After rinsing and soaking the lentils, I couldn’t detect any changes in taste, and lentils have never caused problems for me, even without soaking. I’ll continue using this method though, as soaking and rinsing lentils appears to have a lot of other benefits besides warding off stomach upset.
I won’t comment on your recipe Frank, as I added too many different ingredients. It’s what I had on hand.
Another way to speed up pulse soaking is to add a teaspoonful or so of bicarbonate of soda to the soaking water.
Good to know, Iain. Thanks!