In a medium saucepan over medium heat, combine all of the ingredients except for the Grand Marnier. Cook, stirring frequently, until the cranberries start to pop (about 10 minutes).
1/2 cup granulated sugar, 1/2 cup light brown sugar, 1/3 cup water, 1/3 cup orange juice, 12 ounces fresh cranberries, 1/4 teaspoon pumpkin pie spice
Remove from heat, stir in Grand Marnier and place sauce in a bowl. Cranberry sauce will thicken as it cools.
1-2 tablespoons Grand Marnier
Notes
Store cooled cranberry sauce in an airtight container in the refrigerator for up to a week or in the freezer for 1-2 months.