Hot soba and udon are served in a soup made from light fish stock , seaweed and soy . cold noodles are a summer favourite whether served plain with a dipping sauce on the side or in a bowl with toppings 吃冷面的话,将煮好的荞麦面用冷水过一下,然后放在竹屉上,撒上紫菜碎,蘸着加入葱花或少许辣根的酱油进食,清爽提神。