Combine all of the ingredients in a slow cooker. Set to high heat, cover and cook for 3 hours. Stir halfway through, using the back of the spoon to smash the cranberries. The sauce will thicken as it cools. If you prefer a thicker sauce you can allow to cook for another hour before cooling.
Notes
*1/2 cup maple syrup yields a lightly sweet, tart cranberry sauce. You can substitute honey for a sweeter cranberry sauce or add a few tablespoons of sugar, such as coconut sugar or organic cane sugar.