Next measure out your grains then pour them into your hot tap water.. After you have your grains in the hot tap water, you will next want to agitate your grains in the hot tap water to separate all the dirt and dust from your grains.. Fill your sterilizer, boiling pot, or pressure cooker up to about 2/3 the way full of hot tap water. Soak the hominy overnight: Rinse the dried hominy and put it in a large container. Cover with 8 cups water. You can drain water and use it as a stock for soups for any curries you make. Pressure cooking – This is the easiest method, add corn , just pour water and pressure cook for 3-4 whistles.Let the pressure release by itself and you are done. Pressure cooking may be hundreds of years old, but it has gained a resurgence in the past couple of years. Pressure Cook Grains Timing Charts. Almost all imaginable types of food can be prepared using a pressure cooker- even grains. Pressure cook the hominy for 40 minutes with a quick pressure release: Drain and rinse the hominy, then pour the drained hominy into the pot. In fact, nothing makes grains and legumes better than a pressure cooker can. Let the hominy soak for at least 8 hours, or overnight.