Easy recipe Crispy Roast Duck with Blackberry Sauce

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one/two cup plus one tablespoon unsalted butter (Recipes by ingridients butter) one quarter cup white sugar one third cup dry white wine: Chenin Blanc or Sauvignon Blanc one quarter cup orange juice one quarter cup lemon juice two tablespoons red wine vinegar (Recipes by ingridients vinegar) one one/two cups frozen blackberries, thawed one three/about four cups chicken broth two tablespoons Cognac one tablespoon Vermont maple syrup about four (five- to about six-ounce) duck breast (Recipes by ingridients duck breast) (Recipes by ingridients breast) halves with skin Kosher salt to taste Black pepper to taste Additional blackberries for presentation. .