Resting chapati dough allows the gluten to relax and hydrate, resulting in softer, more pliable dough that's easier to roll and produces softer chapatis. Insufficient resting leads to tough, elastic dough that shrinks back when rolled.
When you mix flour and water to make chapati dough, gluten proteins begin to form a network. This network gives the dough its elasticity and strength. Kneading helps to develop this gluten network further. However, over-kneading or insufficient resting can lead to a tough dough.
Resting the dough after kneading is crucial for several reasons:
A well-rested dough will be smooth, elastic, and easy to roll into thin, even chapatis. The resulting chapatis will be softer, puff up better, and have a more pleasant texture. A minimum resting time of 30 minutes is generally recommended, but longer resting times (up to a few hours) can further improve the dough's quality.
Cover the chapati dough with a damp cloth or plastic wrap while resting to prevent it from drying out and forming a crust. A dry crust will hinder gluten relaxation and make the dough difficult to work with.