Winter is a good time to eat chestnuts. Sometimes when walking on the street, you can smell the smell of fried chestnuts with sugar. The sweet taste can easily arouse people's taste buds. I believe you have also found that the stir frying pots of chestnut are full of sand. Why do you want to stir fry chestnut with sand? Let's see below with questions.
Why to use sand to stir fry chestnut
We know that the specific heat capacity of iron is small and the heat transfer is rapid; on the contrary, the chestnut shell has a large specific heat capacity and a small thermal conductivity. Therefore, most of the heat is absorbed by chestnut shell, and only a small part of the heat is transmitted to the inside of chestnut shell for heating chestnut kernel. The stone has a large mass and a thermal conductivity between the iron pot and the chestnut shell. It can absorb a lot of heat, but the temperature will not rise too fast, so that the chestnut kernel will have enough time to be fried at a suitable temperature. In the process of frying chestnuts, it is necessary to constantly turn the stones, so as to ensure that the chestnuts are evenly heated in all directions; in addition, turning the stones can make the stones more fully contact with the chestnuts, which is helpful to improve the heat transfer efficiency.
What kind of sand is used to stir fry chestnut
Stir fried chestnut sand is quartz sand, to choose larger particles, after many times stir fried, sand will be polished smooth without edges and corners. Generally, in order to make the roasted chestnut color and flavor complete, the roaster often needs to 'cultivate' the sand. When the sand is stir fried, maltose, honey and vegetable oil are added at the same time, and the attachment on chestnut is added. After high temperature heating, the sand turns black gradually.
Can old sand be reused
Generally speaking, with the use of stir fried sand, the larger the particles will be. Some people want to reuse, first heat the sand and then put it into the water, others directly put it into the water for more time, then clean it and use it. However, due to long-term friction, generally there are less particles in old sand than in new sand. More commercial stir fried sand with lower cost is no longer reused and replaced with new sand directly.