When making ice-covered moon cakes, vegetable oil or edible oil can be applied to the moon cake mold to prevent the moon cakes from sticking. Common choices include peanut oil, sunflower oil, corn oil and olive oil. These vegetable oils can be applied to the mold of ice-covered moon cakes to ensure the smooth demoulding of moon cakes. However, it should be noted that pure and odorless vegetable oil should be selected to avoid affecting the taste of moon cakes.