Trenette al pesto

Method

1. 1 Grind basil with garlic, pine nuts, olive oil, and two types of cheese in a mortar to make pesto.
2. 2 They pound the basil leaves in a mortar and pestle instead of grinding them in a machine; the blades heat the basil leaves and turn the pesto a dark brown color.
3. 3 Cut the potatoes into 5 mm thick slices and the green beans into 4 cm pieces.
4. 4 Boil the potatoes in a pot of salted water for 6 minutes, then add the green beans and noodles to the same pot.
5. 5 Boiling them together in one pot is the original method from the Ligurian region; the potato starch helps the pesto adhere to the pasta better.
6. 6 Remove everything from the pot, then mix it with pesto from the stove and season with the broth.