Soybean foam. Outside is yellow, inside is empty, this kind of tofu in the vegetable market is called soybean foam, is after a long time in the water inside the fine throwing produced, very good selling. Vegetable market refers to an area for the sale of vegetables, fruits and vegetables, aquatic products, eggs, meat and its products, grain and its products, soy products, cooked food, condiments, souvenirs and other types of agricultural products.