Nagaimo belong to yam family. Other yams need to be cooked before eating, but this one can be either eaten raw or cooked. It’s a regular item at many Asian grocery stores, so that if you live near one of them, you should find it pretty easily.
Nagaimo is one of the favorite food during summer. This is called nagaimo somen, because thinly sliced nagaimo resembles somen noodles, even though no somen noodles are used in this recipe.
I previously uploaded a mugitoro rice recipe, but here is another recipe, which calls for this slippery root vegetable. You can eat this dish by itself while drinking chilled sake, pour over cooked rice, or mix with cold noodles such as somen or soba. This is appetizing in hot summer days.