Tentsuyu is a traditional Japanese dipping sauce commonly used with soba and udon noodles. It is made from a blend of dashi (a Japanese soup stock), soy sauce, and mirin (a sweet rice wine). The sauce is typically served warm and enhances the flavor of the noodles when dipped. This sauce can also be enjoyed with various tempura dishes, adding a savory element to the meal. Tentsuyu is often garnished with green onions or grated daikon for added texture and flavor. It is a staple in Japanese cuisine, appreciated for its simplicity and depth of taste.