Matcha soba or cha soba is a traditional dish made with buckwheat flour and matcha tea. The tea is made from green tea powder and it has a bitter, mellow, or slightly sweet flavor. The soba noodles are infused with matcha, becoming green in the process.
They are boiled, strained, rinsed and dried, then served with chopped green onions, wasabi, and tsuyu dipping sauce on the side. The noodles are served either on a large plate or a zaru soba tray. If desired, the dish can be topped with shredded nori or tenkasu (tempura flakes).