Take beef, sliced as thinly as possible and cut into short strips, and sauté it over a very high flame with a clove or two or slightly crushed garlic until it has just lost its raw color. Season liberally with salt and pepper, mix and remove from the heat. Throw is a few handfuls of raw arugula, toss until they have wilted, and serve immediately with a nice piece of crusty bread to sop up the delicious juices.