Spiced Fava Bean Soup with Rice and Tomato

Name: Spiced Fava Bean Soup with Rice and Tomato
Ingredients: 2 medium onions, peeled, quartered; 4 garlic cloves; ½ cup olive oil; Kosher salt and freshly ground black pepper; 2 teaspoons ground cumin; ½ teaspoon ground coriander; ¼ teaspoon ground allspice; 1 14.5-oz. can crushed tomatoes; 8 cups low-sodium chicken or vegetable broth; 8 oz. dried skinless fava or lima beans (about 1½ cups); ¼ cup short-grain brown rice; ⅓ cup plain Greek yogurt; ⅓ cup chopped unsalted, roasted pistachios