Is the thing steamed in a steamer cooked faster on the top or cooked faster on the bottom?

Of course, the top is cooked first. The basic appliance of steaming should be retort. Zan's invention can be found in Yangshao culture, Yangshao culture in the northern Yellow River valley and Songze culture in the south, all of which have a history of more than 5,000 years. Especially in the southern Neolithic culture, there appeared an object connected with the pot below, which was called a pot in archaeology. It holds water under it and has a grate in the middle. After the water is boiled, the food on it is steamed. This is a very great invention. We know that although the invention of steam cars in the west is a great contribution, our history of using steam should be said to be much longer. This method, until now, has been widely used in China cooking. This is also a difference between us and western food culture. Because the western culture is mainly fried and roasted, they make steak, not bread; We make steamed bread because we steam it. Our steaming method should be especially the pride of our ancient chefs and a great contribution. Because we know that French cuisine is very famous in the world, but not long ago, French chefs did not know the method of steaming, nor did they have the concept of steaming. He didn't use this method. This is the scene of steaming food with retort that we saw on the Han Dynasty stone relief. In fact, it still feels the same as Zan, but it was put on the stove. Later, Zan was improved more. For example, bamboo replaced copper and pottery, and a steamer appeared. We also saw the image of the ship on the Han stone reliefs. This is not found in the literature, but we have seen it on stone reliefs. A very standard image of a steamer was found in a stone tomb in Mi County, Henan Province. This is steamed, and we talked about its early development. Next, let's talk about the steamer related to it. It also uses steam to cook food. As we all know, Qiguo chicken is considered to be produced in Yunnan. This kind of steamed chicken we are eating now should come from there. Generally called Yunnan steamed chicken, and they are all cooked chickens. This kind of gas stove is a clay pot with a hole in the middle, then the gas is strung from the bottom and the food is cooked. Judging from the evidence of archaeological discoveries, it should be said that gas pots existed in the Shang Dynasty. Such a steamer was unearthed in Fu Hao's tomb in the famous Yin Ruins of Shang Dynasty. It is made of bronze. What about its gas tank? It should be said that there is an air column in the middle, which is no different from the current gas cooker. Later, we learned that some gas tanks were unearthed in Han Dynasty and Tang Dynasty, all of which were made of pottery and porcelain. The larger one is made in Guizhou. Guizhou is next to Yunnan. This is from the Han Dynasty, which shows that Yunnan gas stoves have a long history.