Honeycomb toffee, honeycomb candy, sponge toffee, cinder toffee, seafoam, or hokey pokey is a sugary toffee with a light, rigid, sponge-like texture. Its main ingredients are typically brown sugar (or corn syrup, molasses or golden syrup) and baking soda, sometimes with an acid such as vinegar. The baking soda and acid react to form carbon...