Chilling samosa dough allows the gluten to relax, resulting in a more tender and less elastic dough that's easier to roll out and less prone to shrinking during frying. This leads to a flakier and more delicate final texture.
Chilling samosa dough is a crucial step in achieving the desired texture. When you mix flour and water, gluten develops, which is responsible for the dough's elasticity. Overworking the dough leads to excessive gluten development, resulting in a tough and chewy samosa. Chilling the dough allows the gluten strands to relax and unwind. This relaxation process makes the dough more pliable and easier to handle.Furthermore, chilling also helps to hydrate the flour particles more evenly. This even hydration contributes to a more consistent texture throughout the dough. When the dough is fried, the relaxed gluten and even hydration result in a flakier, more tender crust that is less likely to shrink or become tough. The cold temperature also helps solidify the fat (if any is used in the dough), which further contributes to flakiness.
After chilling, let the dough rest at room temperature for about 15-20 minutes before rolling it out. This will make it even easier to work with and prevent cracking.