Field Peas in Peanut Gravy

Name: Field Peas in Peanut Gravy
Ingredients: 2 medium sweet onions; 2 cups dried peas, such as Sea Island red peas; 3 medium bell peppers; 3 medium carrots; 2 medium celery stalks, or 1/2 large fennel bulb; 5 dried dates; 5 cloves garlic; 2 tablespoons unsalted butter or olive oil; 3 large bay leaves; 1 tablespoon granulated onion; 1/2 teaspoon dried fennel seeds; 1/8 teaspoon ground cayenne pepper; Kosher salt; Freshly ground black pepper; 3 cups vegetable stock or broth; 1/2 cup ground peanuts or chunky peanut butter