To Make Sauce
Combine Sauce ingredients, except sesame oil, in a pot and bring to boil. Take off heat and cool in fridge.
Add crushed white sesame seeds and sesame oil in the cooled sauce to finish it off. Leave aside.
To Make Hiyashi Chuka
Cook noodles by following the instructions on the package. Cool in ice water then drain and leave aside.
In a bowl, place desired amount of noodles in the centre, followed by desired amount of salad. Then pour sauce over the top to serve.