Aged rice absorbs less water and results in drier, more separate grains compared to fresh rice. This is why it's preferred for biryani, as it prevents the dish from becoming mushy.
The age of rice significantly impacts its starch structure and moisture content, which directly affects its cooking properties. Freshly harvested rice contains a higher moisture content and a starch structure that readily absorbs water during cooking. This leads to a softer, stickier texture.
Aged rice, on the other hand, undergoes a drying process over several months or even years. This aging process reduces the moisture content and causes the starch molecules to crystallize and harden. As a result, aged rice absorbs less water during cooking, leading to grains that remain separate, fluffy, and less prone to clumping.
For biryani, the desired texture is distinct, separate grains that don't stick together. Aged rice is ideal because it provides this texture, allowing each grain to retain its shape and absorb the flavors of the spices and other ingredients without becoming mushy. The lower moisture content also contributes to a lighter and more flavorful biryani.
Always rinse aged rice thoroughly before cooking to remove excess starch and further promote separate grains. Soaking the rice for 30 minutes before cooking can also help ensure even cooking and prevent breakage.