...melted In a heavy saucepan, combine sugar, corn syrup and vinegar. Cook over medium heat, stirring constantly, until sugar dissolves. Cook without stirring until the temperature reaches 300 (hard crack stage) on a candy thermometer. Do not overcook. Remove from the heat and quickly stir in baking soda. Pour into a buttered 13-in. x 9-in. x 2-in. baking pan. When cool, break into bitesize pieces. Dip into melted chocolate; place on waxed paper until the chocolate is firm. Store candy tightly covered. Yield: 1- half pounds