1. Cook the pasta in a large pot of salted boiling water for the time indicated on the package for normal cooking. Drain, reserving some cooking water. Let cool.
2. String the snow peas and wash them. Blanch them in a pot of salted boiling water for 5 minutes, then drain and immediately plunge them into a bowl of ice water. Drain after 5 minutes.
3. Wash, dry, and separate the basil leaves. Reserve a few leaves for garnish. Peel the garlic. Blend together the basil, garlic, pine nuts, and Parmesan cheese. Gradually add the oil while blending. _ Alternatively, use store-bought pesto!
4. Place the pasta in a large dish. Add the pesto and mix, adding some pasta cooking water. Stir in the snow peas, grate the lemon zest over the top, and add a little of its juice. Mix well and garnish with basil leaves before serving.