Eggplant is too old. Eggplant is too old and its skin is too thick. If you don't peel it when frying or frying, the skin of the old eggplant will become hard because of frying or frying, and the entrance will be astringent and even bitter.

When the seasoning is added at the wrong time to cook eggplant, if the soy sauce is not good, then the sugar is put too early, and it will burn in it for too long, which will easily lead to bitter eggplant.

In the process of cooking with too much salt, even if the normal eggplant is put with too much salt, the taste will change. Excessive salt will generally make the dish bitter. Therefore, when frying eggplant, too much salt will be bitter.

Soak the cut eggplant in water for a while for too long, which can avoid the eggplant from turning yellow and remove some astringency. However, if the soaking time is too long, the bitter taste in and out will seep into the eggplant meat, which will make it bitter, so the eggplant can't be soaked for too long.