Double-skin milk is made by using casein in milk to solidify when it is heated. The specific production method is as follows: Boil the freshly squeezed buffalo milk in the morning, but it can't be opened. Pour it into a bowl while it is hot, and the hot air will make the milk skin on the surface of the milk; After the milk is completely cooled, leave the skin and remove the milk, then add fine sugar and protein to the poured milk, stir it evenly, slowly pour the mixed milk back into the original bowl, float the original milk skin, steam it on the fire, and soon it will produce a layer of skin again; A bowl of double-skinned milk is made.

Jelly is made by mixing gelatin, agar, xanthan gum and other gel substances, adding sweetener, pigment, juice or essence, and condensing.