In a soup pot, boil 2.5 liters (10 cups) of salted water.
Add the Ayocote Blanco beans.
Next, add the vegetables gradually in the following order: carrots, potatoes, leek, haricots vert, zucchini, and tomatoes.
Cover and cook over low heat for 1 hour.
While the soup is cooking, prepare the Pistou: Chop 1 bunch of fresh basil leaves with 5 minced garlic cloves.
Transfer to a bowl and add 1 teaspoon fresh lemon juice and 20 cl of extra-virgin olive oil. Mix together.
After an hour of cooking the soup, remove the pot from the heat and add the Pistou mixture.
Serve hot with grated parmesan cheese to taste.
