Air pockets in chapati dough are primarily caused by gluten development and the release of steam during cooking. Proper kneading develops gluten, trapping air, and this air expands when heated, creating pockets.
The formation of air pockets in chapati dough is a result of a few key factors working together:
Gluten Development: Kneading the dough is crucial. Kneading aligns the gluten strands, making the dough elastic and capable of trapping air. Insufficient kneading results in weak gluten, which cannot hold the air effectively.
Hydration: The right amount of water is essential for gluten development. Too little water, and the gluten won't develop properly. Too much water, and the dough will be too sticky to handle and won't trap air well.
Resting the Dough: Allowing the dough to rest after kneading is important. This allows the gluten to relax, making the dough more pliable and easier to roll out. It also allows the water to fully hydrate the flour.
Cooking Process: When the chapati is cooked on a hot tawa (griddle), the water in the dough turns to steam. The trapped air and steam expand, creating the characteristic air pockets. Flipping the chapati at the right time is also important to ensure even cooking and proper puffing.
To encourage more consistent air pockets, try adding a small amount of oil or ghee to the dough while kneading. This helps to create a more tender and pliable dough that puffs up more easily.