Combine all ingredients, and bring to a boil.
Pour into individual sauce dishes as dip for each person's shrimp.
Note: Raw harusame noodles are thin transparent noodles made of soybean powder.
When cooked they resemble shredded coconut and are available in Japanese stores.
Tempura sauce in the Japanese manner is made of a fish-seaweed broth, mirin (sweet rice wine) and soy sauce.