2 cups onions, chopped

2 teaspoons olive oil

1/3 cup peanut butter

6 cups sweet potatoes (not yams), peeled and cut into 1 inch cubes

1 tablespoon ground cumin

1/4 teaspoon salt

1/2 teaspoon pepper

1/4 teaspoon cayenne pepper

2 (15 1/2 ounce) cans garbanzo beans, undrained

2 (14 1.2 ounce) or 1 (32 ounce) cans low-sodium vegetable broth