1. Follow the instructions for Kathan Daal. Add more water to cooked daal to get 6 cups daal water. Pass the cooked daal through a sieve. Set aside the cooked daal for making kathan daal.
1. My grand aunt didn't use pressure cooker for cooking daal. It used to take a long time, but she would keep adding more and more water to get daal water while it was cooking. I use pressure cooker and can't add too much water for cooking the daal. So I use more amount of water than usual and then add some more water to the cooked daal and mix & then pass through the sieve to get the daal water for osaman.