Cranberry-orange compote

1 12-oz. bag fresh or frozen cranberries (3 cups)
2 tablespoons grated orange peel
1 1/2 cups orange juice
1 cup granulated sugar, or to taste
2 tablespoons orange flavored liqueur, optional

1. In a heavy medium saucepan, combine cranberries, orange peel, juice and sugar. Simmer over medium heat, stirring occasionally, until cranberries soften, about 12 minutes. Remove from heat and cool.
2. Stir in liqueur, if using, just before serving.