The fast method is to put the pinto beans in a pan. Cover with water at least three inches above the beans. Bring to a boil. Reduce heat, cover with lid, and simmer for 10 to 15 minutes. Turn off the heat and let the beans sit for one hour with the lid on. The beans will then be plump and ready to cook. Remove the lid after the hour and pour out water. Refill beans in pan with clean water, covering beans at least one inch above the beans.