Step 1

Make the dressing by whisking together the water, soy sauce, tahini, rice vinegar, sesame oil, sugar, ginger, salt and white pepper until the dressing is emulsified.

Step 2

Prepare all the toppings.

Step 3

Boil the noodles according to the package directions.

Step 4

Drain the noodles and wash them with running cold water to remove any excess starch from the surface of the noodles.

Step 5

Put the noodles in a bowl of ice water to chill them, and then drain the noodles well, removing any excess ice.

Step 6

Split the noodles between two bowls, and then drizzle with some of the dressing.

Step 7

Arrange the cucumber, tomatoes, ham, and usuyaki tamago on top of the noodles and then garnish with sesame seeds. Serve the hiyashi chuka with extra dressing on the side.