Generally, it will be cooked in 5- 10 minutes and can be tied with chopsticks. If it is easy to penetrate, it means it is ripe. To make cold eggplant, it is recommended to steam the whole eggplant in a pot without cutting it. Water vapor will enter the cut eggplant, and the taste will be discounted. Steam the cold eggplant for a few minutes and it will be cooked. Don't steam eggplant for too short time, otherwise it may be hard and taste bad, and don't steam it for too long. If it takes too long, the eggplant will ripen. The size and heat of eggplant will affect the steaming time. Before turning off the fire, you can open the lid to see if it is cooked before deciding whether to turn off the fire. Seasonings for the sauce of cold eggplant can be: salt, soy sauce, pepper, soy sauce, oyster sauce, sugar, onion, garlic, sesame seeds, vegetable oil and so on.