Eggplant is bitter and chewy. Maybe you bought old eggplant, which is high in solanine and harmful to human body. Avoid eating too old eggplant. At present, there are two kinds of eggplant in the vegetable market, one is produced in the vegetable base and is larger; One is produced by farmers, with different sizes and thicknesses. How to choose fresh and delicious eggplant? When buying eggplant, there is a light-colored ring at the junction of eggplant sepals and fruits. The wider the ring is, the more obvious it is, and the faster the eggplant fruit grows without aging. If the band is not obvious, it means that the eggplant has stopped growing at harvest and is an old eggplant. Second, see if the eggplant is elastic. Some consumers think that a small eggplant will be tender, but it is not. When buying, gently press the surface of eggplant with your fingers. If the finger print of eggplant does not rebound after letting go of your finger, it means that eggplant is old, and it will taste like chewing wax whether it is cooked or cold.