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Soupe au pistou is a simple French spring soup that is ready in under an hour.
Prepare the Pistou: Pulse tomato, basil, parsley, and garlic in a food processor until chopped, about 5 pulses, stopping to scrape down sides as needed. With processor running, gradually pour oil through food chute until tomato mixture is finely chopped and creamy, about 30 seconds. Transfer to a small bowl; stir in cheese and salt. Set aside until ready to use.
Prepare the Soup: Heat oil in a large heavy-bottomed pot or large Dutch oven over medium. Add leek, celery, carrot, thyme, pepper, and 1/2 teaspoon of the salt. Cook, stirring occasionally, until leek starts to turn golden brown, about 10 minutes.
Add water and potato: Add 8 cups water and potato, scraping up any browned bits stuck to bottom of pot. Bring to a boil over high. Reduce heat to medium-low, and simmer, undisturbed, until potato is tender, about 10 minutes. Add kale, zucchini, fava beans, and pasta. Bring to a boil over medium-high. Boil, stirring occasionally, until pasta and vegetables are tender, about 10 minutes.
Add Pistou to Soup: Remove pot from heat. Stir in 1/2 cup of the Pistou and remaining 1 3/4 teaspoons salt. Garnish Soup with grated cheese, and serve with remaining Pistou for topping.