Step 1: Make the ragù: This is the real 'heart' of the dish that gives the dish its savor. Since it takes several hours to make, and benefits from an overnight 'rest', better to make your ragù the day before. The recipe is set out in this post.

Step 2: Make the pasta: Make fresh egg pasta dough and roll it out into thin sheets following the master recipe. Then cut the sheets into lengths about as long (or wide) as the baking dish in which you plan to bake your lasagne. Take care, as the pasta will expand when it is cooked, so cut them just a bit shorter than the actual length or breadth of the pan. Since the pasta is not cut into strips as for fettuccine or taglierini, you need not dry the pasta if you're ready to make the lasagne right away. (NB: The true 'doc' version of lasagne alla bolognese is made with spinach pasta. Will post on this one of these days.)

Step 3: Make the béchamel: Prepare the béchamel sauce, once again using the master recipe. (NB: You may not need this much béchamel, but better to have too much than too little. There are lots of uses for leftovers.)

Step 4: Cook the pasta and assemble the dish: Take your pasta sheets and simmer them, only one or two at a time, in well-salted water for just a minute or two, depending on just how thinly you've rolled out your pasta, and how long the pasta has been drying.

As each pasta sheet is done, fish it out of the water with a slotted spoon (the larger the better) and place it on a towel. With another towel, pat it dry. Then place the pasta sheets at the bottom of a greased baking dish, covering the entire bottom of the dish. It's OK to overlap the sheets a bit, but if there's too much overlap or the sheets are too big for the dish, you can always trim the cooked sheets to size.

Then add a thin layer of béchamel over the pasta, making sure to cover the entire surface of the pasta with a spatula. Lay over some of the ragù, then a generous dusting of grated parmesan cheese. (NB: Since all the components—pasta, ragu and béchamel—should be well seasoned, there should normally be no reason to season the dish as you assemble it.)

Repeat until you have run out of ingredients, or the baking dish is nearly full, or you've reached about four layers, ending with a layer of béchamel, sprinkled with parmesan cheese and dotted with butter. (More than that and the lasagne will not cook properly.)

Step 5: Baking the lasagne: Bake in a moderate oven (180°C, 350°F) for about 30 minutes, or until the top is just slightly browned on top (see top photo). Allow to rest for at least 15 minutes before serving