4 pounds apples (skins on), washed, cored, and cut into 1-inch pieces
Simmer apples, covered, in a large saucepan with 1/3 cup water until tender, about 10 minutes. Transfer mixture to a blender. Working in small batches, blend until smooth. Pass through a fine sieve. For a coarser texture, pass apples through a food mill or pulse in a food processor. Fill 1/4 cup plastic containers or ice-cube trays.