1) Peel the potatoes and cut them into thin slices or into small cube. Trim green beans, wash and cut them into small pieces of about 3 cm.
2) Boil generous water in a capacious cauldron. When the water reach the boiling point put inside the cauldron the green beans and the potatoes. After 5 minutes add also the Trofie.
3) When Trofie are cooked, drip all ingredients together.
4) Mix in a bowl pasta with Genoese Pesto diluted with two tablespoon of cooking water.