Cool soba is traditionally served on a bamboo tray called a zaru that is set over a plate. In fact, the dish’s full name is zaru soba. Though cheap zarus made of plastic are common, bamboo ones can be lovely, and they make for an elegant, authentic presentation of the simple noodles. Regardless of the material, a zaru acts as a colander, allowing residual water on the noodles to drain away. They’re inexpensive, often just a dollar or two, and are available in stores at the Kam Man Marketplace in Quincy (219 Quincy Avenue, Quincy, 617-328-1533, kammanshops.com).