Maple Sponge Candy This tastes like the old-fashioned sea foam candy which used to be available at Christmas time. 1 cup maple syrup 1/2 cup granulated sugar 2 teaspoons white vinegar 2 teaspoons baking soda 1 cup milk chocolate chips, melted Combine syrup, sugar and vinegar. Cook to hard crack stage (300 degrees F). Remove from heat. Quickly sift in baking soda. Mix well. Pour into a 9-inch square pan. Glaze with melted chocolate chips.