no wonder Breadtalk so successful
Food science is no rocket science.
How it Works
Alum is used as a slow-acting leavening agent in dough preparation. When mixed with sodium bicarbonate (baking soda) and heated during the deep-frying process, a chemical reaction occurs that releases carbon dioxide gas:
The resulting aluminum hydroxide forms a membrane-like substance within the dough, which traps the expanding
bubbles. This process causes the food to swell, resulting in a light, porous interior and a golden, crispy exterior when fried. It has also been noted to reduce oil absorption in some contexts, contributing to a crisper result.