Cranberried Demi-Glace Sauce

Ingredients

• • 1 tablespoon (15 ml) red wine vinegar
  • 1 cup (250 ml) fresh cranberries
  • 1 tablespoon (15 ml) sugar
  • 2 cloves garlic, finely chopped
  • 3/4 cups (180 ml) cold cranberry juice
  • 1 1/4 cups (310 ml) demi-glace sauce
  • 2 tablespoons (30 ml) cold butter
  • Pepper