This recipe has been in the family of senior editor Randi Danforth for generations. Her great-grandmother bought penny sponge candy to take to the movies in Minnesota. A love for the crunchy sweet led to recipe experiments in the kitchen. Randi recalls watching her mother make this magical confection--the baking soda causes vigorous bubbling. Pack it in jars or airtight tins, and store at room temperature; exposure to moisture and air will soften the candy.
