Rinse the cranberries, reserve a handful and transfer to a large pan. Add a piece of orange peel, orange juice, water, and sugar. If using frozen cranberries you don't need to thaw before using.
Place over medium low heat stirring occasionally for about 10 minutes then increase temperature to medium-high and stir for about 5 minutes or until the berries burst and the liquid thickens the desired amount. Stir in the reserved berries toward the end.
Fresh or frozen cranberries work equally well.
If you're using fresh orange peel then go ahead and use fresh orange juice as well. Your sauce will taste all the better.
When you increase heat for the final cook down look at the consistency, not the time. You can have a sauce with a thinner or thicker consistency, it's really up to you.
Store your cranberry sauce in a sealed container in the refrigerator until ready to use.