Tex-Mex Meatball Soup
["1 onion", "1 zucchini", "1/2 lb. ground beef", "1 tsp. chili powder", "salt and pepper", "1 Tbsp. oil", "1 tsp. ground cumin", "1/2 tsp. oregano", "1 (1 lb.) can tomatoes", "1 2/3 c. beef stock or canned broth", "1/8 tsp. hot pepper sauce", "chopped fresh coriander (optional)"]
["Chop onion.", "Cut zucchini into 1-inch pieces.", "Combine beef, chili powder, 1/2 teaspoon salt and 1/4 teaspoon pepper.", "Shape into 1-inch balls.", "In a Dutch oven, heat oil over medium heat. Add meatballs; brown well.", "Remove meatballs and reduce heat.", "Add onion and zucchini.", "Cover and cook 5 minutes.", "Stir in cumin, oregano, tomatoes with their juice, stock, hot pepper sauce, 1/4 teaspoon salt and 1/4 teaspoon pepper.", "Cover and simmer 15 minutes.", "Add meatballs; heat through.", "Sprinkle with fresh coriander."]
["onion", "zucchini", "ground beef", "chili powder", "salt", "oil", "ground cumin", "oregano", "tomatoes", "beef stock", "hot pepper sauce", "fresh coriander"]