What You Need to Know
During boiling, the starch granules in the dough absorb water and swell, undergoing gelatinization that gives the dough its soft yet elastic texture. Simultaneously, the meat proteins denature and coagulate, forming a firm filling. A slight increase in pH from vinegar or baking soda can accelerate these reactions, improving texture.
The Science
Primary Reaction
Gelatinization of starch and denaturation/coagulation of meat proteins during boiling at 100 °C