2, sweet potato tofu tomato soup: mainly use sweet potato, tomato sauce, fat tofu, pepper, green onion, water, salt, first cut the green onion, cut the sweet potato into pieces, add the right amount of water into the soup pot, add the right amount of tomato sauce after the water boils, and cook again until the water boils. At this time, turn to slow fire for about 20 minutes, and then put the cut lactone tofu in.