Peel, core and cut apples into 1- to 2-inch pieces. Place apples and water in a microwave-proof container. Cover.

Microwave on high until apples are soft and easily pricked with a fork (about 8 minutes; the time will vary depending on your microwave).

Remove apples from microwave and drain. Place ½ of them in blender and blend until smooth. Repeat with remaining apples. Stir orange juice and brown sugar into the apples. If using, add cinnamon, to taste.

Serve apple sauce warm or chilled.