How to avoid the smell of onions: (1) Making salads: Fruits and vegetables contain vitamins, enzymes and other substances, which can react with propylene sulfide and be eaten with onions to make salads, thus avoiding the problem that onions smell after eating; (2) Used for frying cooked food with other foods: after onion is fried, it can volatilize part of propylene sulfide, and then it can be fried with other foods, which can cover up the residual onion smell and avoid the odor after eating.