In a small saucepan, over medium heat, add apples, cranberries, sugar, and water.

Simmer, stirring occasionally, for 15 minutes, or until apples are falling apart and cranberries have popped.

Continue cooking for 5 to 10 minutes more, until mixture is very thick and a bright scarlet color throughout.

Store, covered, in the refrigerator for up to 3 days.