In a large dutch oven, brown ground beef and sausage, drain and set aside. In the dutch oven, melt the butter, add the rice, onions, green pepper and garlic; Cook until rice is browned and vegetables are tender. Stir in the remaining ingredients except the sour cream,cheese, and lime juice. Bring to a boil, and reduce heat to low and cook until rice is tender. (about 30 minutes) Serve hot with shredded cheese on top and a dollop of sour cream.