Soupe au Pistou

Preparation

1. For the Soup

   1. Step 1

      Drain the white beans and combine with 2 quarts water in a large, heavy soup pot or Dutch oven. Bring to a boil. Skim off any foam, then add half the onion, half the garlic and the bouquet garni. Reduce the heat, cover and simmer 45 minutes. Add salt to taste.

   2. Step 2

      Heat the olive oil in a heavy skillet, and add the remaining chopped onion and a generous pinch of salt. Cook, stirring, until tender, about five minutes. Add the leeks and remaining garlic. Stir together for a few minutes, and add the tomatoes. Cook, stirring, until the tomatoes have cooked down slightly and the mixture is fragrant, five to 10 minutes. Stir this mixture into the soup pot, add all of the remaining vegetables except the green beans, and bring back to a simmer. Cover and simmer over low heat for 45 minutes to an hour. Taste and adjust the seasonings.

   3. Step 3

      While the soup is simmering, blanch the green beans for five minutes in salted boiling water. Transfer to a bowl of ice-cold water. Drain and set aside.

   4. Step 4

      To make the pistou, mash the garlic with a generous pinch of salt in a mortar and pestle. Remove it and set aside. Grind the basil to a paste in the mortar, a handful at a time, then add the garlic back in and mix together well. Work in the olive oil a tablespoon at a time, then stir in the cheese.

   5. Step 5

      Add the pasta to the simmering soup about 10 minutes before serving, and cook until cooked al dente. Add pepper, taste and adjust salt. Stir the blanched green beans into the soup and heat through. Serve, adding a spoonful of pesto to each bowl for guests to stir in. Pass additional Parmesan for sprinkling.