Traditional Coca-Cola cake, a staple of the American South, usually comes in the form of a chocolate sheet cake that's doused in a gooey glaze. The batter is splashed with a bit of cola, sometimes for flavor but mostly for fluff; the soda's carbonation acts as a leavening agent, similar to baking soda or baking powder, helping the cake rise and come out light and airy.
Cola Syrup
3 cups cola soft drink
.50 cup granulated sugar
2 tablespoons fresh lemon juice
Sweetened whipped cream and amarena cherries (optional)
Bring cola and sugar to a boil in a medium saucepan over medium-high. Boil, uncovered, stirring occasionally, until reduced to 1 cup, 30 to 40 minutes. Remove from heat. Stir in lemon juice. Reserve 1/4 cup cola syrup in a liquid measuring cup for glaze.