Boiling water for 30 minutes, cold water 1 hour or more. Snow beans are very big, so it is best to soak them in clear water before cooking, so that they are easy to soften when stewing. If hot water is used, it takes about 30 minutes. Soak in cold water for more than an hour. Because snow beans will be dried before sale, it is inevitable that some dust will fall, so don't use the water left after soaking.