Heat up the frozen kara-age using an oven, and slice the cucumbers, tomatoes, and green onions. Set aside.
In a small bowl, mix the following: soy sauce, sugar, vinegar, grated ginger, green onions, and the Hiyashi Chuka Sauce. Set aside.
Boil plenty of water in a pot and follow the package instructions to cook the noodles. Rinse with cold water and drain well.
Place a piece of lettuce on a plate/bowl and place the noodles on top. Arrange the toppings from Step 1 and pour about 2 tbsp of hiyashi chuka sauce over the kara-age. Garnish with Radish sprouts, and you are done! Before serving, pour the rest of sauce and enjoy!