This is Chasoba or green tea flavored soba. It is one of my favorite food of all time. It is meant to be eaten cold and dipped into some Japanese soy sauce (with a dash of wasabi). In fact, one can pick up a packet of this chasoba in supermarkets and cook it just the way you cook spaghetti. Except that you have to run it through ice cold water to make it cold and nice. Lovely!
