The eggplant is bitter and chewy. It may be that you bought old eggplant, which contains a high amount of solanine and is harmful to human body, so you should avoid eating too old eggplant. At present, there are two types of eggplant in the vegetable market, one is produced in the vegetable base, which is larger; One is produced by farmers and varies in size and thickness. How to select fresh and delicious eggplant? When buying eggplant, there is a light-colored ring at the place where the eggplant sepals are connected with the fruit. The wider and more obvious this ring is, the faster the eggplant fruit is growing, and there is no aging. If the girdle is not obvious, it means that the eggplant has stopped growing when it is harvested, and it is an old eggplant. Second, look at whether the eggplant is elastic. Some consumers think that a small eggplant will be tender, but it is not. When buying, press the surface of the eggplant with your fingers slightly. If the finger marks of the eggplant do not rebound after releasing your fingers, it means that the eggplant is old, and it will taste like chewing wax whether it is cooked or cold.