Cold noodles are very popular through out Japan, where they are enjoyed in cafes and noodle bars. Traditionally the noodles are garnished with a little nori and are accompanied with wasabi, spring onions and a dipping sauce. This dish is just a modern twist oon the dish with the addition of smoked salmon and Keta with a light lemon sauce. The noodles make a great lunch dish or light dinner in the hot months of summer. In this recipe I use fresh Soba noodles (Japanese Buckwheat Noodles - see recipe), but of course you can use shop bought ones or somen noodles (fine wheat noodles).