Sponge Candy

Heat sugar, corn syrup, and vinegar to boiling in 2 qt. saucepan over medium heat, stirring constantly, until sugar is dissolved. Boil without stirring, to 300' on candy thermometer (hard ball stage); remove from heat. Quickly stir in baking soda thoroughly. Pour mixture into ungreased 13x9x2 inch pan. Do not spread! Cool and break into pieces. Can then be dipped in chocolate coating if desired.