Pekin Duck With Mandarin Sauce

Ingredients

• 2 5-pound pekin ducks
• 1 tablespoon kosher salt
• 2 teaspoons black pepper
• 2 11 ounce cans mandarin segments
• 4 tablespoons cornstarch
• 6 cups light chicken stock, divided
• 1 cup orange juice
• 4 tablespoons lemon juice
• 2 tablespoons honey
• 2 tablespoons soy sauce
• 4 teaspoons ginger, grated
• 2 tablespoons sugar