A common meal to be eaten in the hot summer months is cold soba. Soba そば or 蕎麦, Sobais made from buckwheat flour, so the color is dark. It can be eaten hot or cold, but the most popular soba dish during summer is cold soba.
How to eat cold soba noodles:
Cold soba can be eaten by dipping it in a soy sauce based cold soup, 蕎麦汁 (soba-tsuyu.) Common side ingredients are seaweed, green onion, and わさび (wasabi=Japanese horse radish). If you are eating noodles with wasabi, the best way to do it is to put a little dab of wasabi on the side of your bowl, dip the noodles in the soup, then drag the noodles up through the wasabi. Yum! You are allowed to make slurping sounds while eating noodles this way - it tastes better, too. Just be careful if you're wearing a white shirt!