Add the cooked beef to the slow cooker along with the rest of the ingredients - chickpeas, fava beans, garlic, bell pepper, onion, broth, tomatoes, salt, pepper, cumin, paprika, coriander, chili powder, cardamom, allspice, bay leaves, and Harissa, if using.
1 16 ounce can chickpeas, rinsed and drained, 1 16 ounce can fava beans beans, rinsed and drained, 4 cloves minced garlic, 1 small red bell pepper, 1 medium yellow onion, 2 1/2 cups low-sodium beef broth or stock, 1 28 ounce can crushed tomatoes, 1 1/2 teaspoon kosher salt, 3/4 teaspoon black pepper, 3 teaspoon dried cumin, 1 Tablespoon paprika, 2 teaspoons ground coriander, 2 Tablespoons chili powder, 1 teaspoon ground cardamom, 1 teaspoon ground allspice, 2 bay leafs, Optional: 1-3 teaspoons Harissa paste