Wash apples, peel and core, and cut into four pieces; Prepare a pot of boiling water and let it cool for later use; Prepare a can bottle with a lid, brush it and dry it. Put the apple in a can bottle, add some sugar, and then inject cold boiled water to keep the water from reaching the apple. Tighten the bottle cap. Put the can bottle into a steamer, steam it for 15 minutes after boiling, then turn off the fire, let it cool, take it out, and the canned apple is ready.