Army Layer Cake

The combination of buttermilk and baking soda creates a chemical reaction that produces carbon dioxide, leavening the cake while the acid tenderizes the gluten structure. Brown sugar adds moisture through its molasses content, preventing the cake from drying out despite the minimal fat. The lard, though used sparingly, creates a tender crumb by coating flour proteins and interfering with gluten development, while cocoa provides structure and flavor depth to compensate for the lean formula.