A lot of recipes for biryani involve sealing the edges of the pot with dough. I generally used a kitchen towel and weigh down the lid with something heavy and don't bother with the dough. I was wondering if there is any benefit to using the dough over the towel.
I use the towel method for some other rice dishes as well as I find the towel helps to absorb some of the moisture as opposed to it condensing on the lid of the pot and dripping back in.