But if there is no onion, onion can be substituted, as long as it is onion. The onion must be a white part near the root of the onion, even if it is green above. Onion water can be boiled, and it has a great effect on cough.

Scallion can also sweat and reduce fever, which can effectively eliminate the cold in the body. However, the taste of scallion is spicy, and people with cold stomachs should try not to eat it.

Precautions for purchase

1. Look at the green onions: Be sure to look at the green onions in the market. If the green onion is more than one third of the green onion itself, it means that the quality of green onion is not good. Too much onion will affect the taste of shallots. Half onion and half onion will taste good.

2, choose southern onions: southern onions are more delicate than northern onions, and the spicy taste in onions is moderate. The southern shallots are not as big as the northern shallots, so the southern shallots taste better.

3, look at onion leaves: onion leaves are particularly important, because when we want to season with onions, we usually use onion leaves. When buying shallots in the vegetable market, you must pay attention to the leaves of shallots. If the leaves of shallots are yellow, shriveled, or have small yellow spots, don't buy them.

4, look at the color: good quality shallots, there are generally two petals on the onion leaves. If you see that the two petals on the onion leaves are symmetrical and the color is clean and pure, then you can buy them with confidence, because the taste and quality of pure onions are quite acceptable.

5. Look at the roots: If the roots of shallots are long, I suggest that you don't choose them, because the shallots with too long roots will have sour taste and affect the taste. So if you buy shallots, try to choose shorter roots, so that shallots will be more refreshing and easy to preserve.

Reference to the above content: Baidu Encyclopedia-scallion