This process includes "one soaking, two boiling and three covers": "one soaking" means soaking for several hours before cooking. "Second cooking" means cooking for one hour. "Three covers" means that when you want to drink, don't let it cook regularly, but let it cook 3 or 4 hours in advance, and then cover it and cook for 3 or 4 hours, so that the porridge cooked will be very sticky.