Cook the tagliatelle in salted water until al dente.
Cut the zucchini into fine strips with a peeler (or finely slice with a grater). Finely chop the garlic and sauté in a little olive oil. Add the zucchini strips and sauté. Add the pasta, pour on the cream and add the juice of the two lemons (to taste). Make sure to taste it often so that it doesn`t get too sour.