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Slow Cooker Butterbean Minestrone


For the basil pistou:

1 teaspoon kosher salt
, plus more to taste

2 cups lightly packed fresh basil leaves

½ cup grated Parmigiano-Reggiano

½ cup shelled roasted unsalted pistachios

½ cup olive oil

Freshly ground black pepper to taste

For the soup:

1 pound dried butterbeans

¼ cup olive oil, plus more for finishing

2 medium sweet onions, diced small

2 quarts vegetable or chicken stock

1 large carrot, diced small

1 celery stalk, diced small

1 teaspoon freshly ground fennel seed

4 plum tomatoes, diced small

1 small zucchini, diced small

1 teaspoon freshly ground black pepper

1 tablespoon kosher salt, plus more to taste

Be sure to soak the butterbeans a day before you plan to make the soup. The basil pistou can be made up to a week ahead of time.


  1. Make the basil pistou: Fill a large saucepan with water and bring it to a boil. Fill a large bowl with ice and cold water and set it nearby. Add 1 teaspoon salt to boiling water. Blanch basil in boiling water for about 20 seconds, until it develops a bright green color, and then immediately plunge it into the ice bath. After a minute, strain basil from water, wrap it in a kitchen towel, and squeeze gently to remove excess water.
  2. Place basil, cheese, and pistachios in a food processor and turn it on. Slowly drizzle in olive oil. Season to taste with salt and pepper. Refrigerate, covered, until ready to use. The pistou will keep in the fridge for about 1 week.
  3. Make the soup: Place beans in a large bowl and add cold water to cover by 3 inches. Cover bowl and soak beans in the refrigerator overnight.
  4. The next day, in a medium skillet over medium heat, warm 2 tablespoons of olive oil. When oil is shimmering, add onions and sauté until softened, about 5 minutes, then remove from heat.
  5. Drain beans and add to a 4-quart (or larger) slow cooker. Add stock, onions, carrot, and celery. Cover with lid, turn to low setting, and cook for 6 to 8 hours, until beans are tender but not busted. Stir in ground fennel, tomatoes, zucchini, pepper, and 1 tablespoon salt. Cover and cook for
 1 hour more.
  6. Season to taste with additional salt.
 Ladle soup into individual bowls and garnish each with basil pistou and a drizzle of olive oil.
From The Chef and the Slow Cooker.
Print Recipe