Coat a small saucepan with cooking spray; place over medium-high heat until hot. Add onion and garlic. Sauté until tender.
Add cranberries, sugar and 1 tablespoon water. Bring to a boil; cook 3 to 5 minutes, or until mixture is thickened. Stir in vinegar. Store in an airtight container and refrigerate.
Serve at room temperature.
Servings: