Bring 4 cups of water to boil in a medium pot and stir in noodles. Cook for 1 to 1 min 30 seconds.
While waiting for the noodles to cook, prepare the Hiyashi Chuka sauce by combining all ingredients in a microwave-safe bowl and microwave for one minute. Let the sauce cool down, set aside.
Once the noodles are cooked, drain and rinse the noodles with running water. Rinsing the noodles will stop cooking and remove excess starch.
After draining, transfer the noodles to a serving plate and add the prepared toppings.
Garnish and serve with Hiyashi chuka sauce.