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.