Somen are very fine Japanese wheat noodles, finer than vermicelli. Look for them in the Asian section of your grocery or at an Asian market. This makes a refreshing lunch or light supper on a hot summer day. You can add cooked, deveined, peeled shrimp if you wish (cut larger shrimp in half). Other suggestion include dried shiitake simmered in equal parts soy sauce and mirin (Japanese sweet rice cooking wine), and watercress or trefoil (a Japanese green somewhat similar to watercress). The dipping sauce is best if made the day before, but it is still good if made the same day. This recipe comes from Shizuo Tsuji's 'Japanese Cooking: A Simple Art', which I highly recommend to anyone interested in traditional Japanese cooking.