Drain and add the dal to a pressure cooker
. Add 3 cups of water, some salt, and ½ tsp turmeric. Close the lid and pressure cook the dals on medium-high heat for 3-4 whistles (about 10-15 mins). Remove from heat and open the cooker only after all the steam has escaped on its own. Alternately cook them in a stock pot for about half an hour until the dals are tender.