Butter is grease, which mainly plays the role of making it not easy to stick and increasing flavor, while condensed milk is a concentrated dairy product, which is easy to stick or even burn when heated. If there is really no butter, you can use ordinary vegetable oil instead.

Butter is a kind of solid grease processed from milk, which is the product of mixing fresh milk and filtering some water from the thick objects on the upper layer. Mainly used as seasoning, it is rich in nutrition but high in fat, so don't overdo it. Condensed milk is a kind of milk product, which is a beverage made of fresh milk or goat milk after disinfection and concentration. Its characteristic is that it can be stored for a long time.