1.making the soup stock In a big cooking pot, add 1L water, chicken, green parts of a leek and ginger (optional). Heat over high heat and bring it to a boil. Once it boils, reduce the heat to low and simmer for about 10 min.
2. Remove from the heat. Take the chicken, leek and ginger out to a plate. Strain the stock with a sieve to another big cooking pot. Add 1L water more into the stock, then set aside.
3. In a frying-pan, heat 1 tbsp oil and place the boiled chicken skin side down. Cook for about 3~4 min both sides or until a nice golden brown. Add the chicken sauce ingredients (mirin, cooking sake, soy sauce, sugar) and cook until the sauce is reduced about half while flipping the chicken. Turn off the heat. Slice the chicken into bite-size pieces and set aside for the ramen topping.
4.making the shio sauce soup base In a small heat-resistant bowl, add the chopped leek, garlic (grated), shantung, katsuo flake and kosher salt. Set aside.
5. In a small cooking pot, add sesame oil, vegetable oil and heat over medium heat until almost boiled. Remove from the heat and pour this oil over the leek in the bowl from #4. Mix.
6. Add cooking sake, soy sauce and hondashi powder. Mix and set aside.
7. Cook noodles according to the package instructions. Meanwhile, place some "shio soup base" in a serving bowl and pour the soup stock (boiled). Immediately place the cooked noodle into the soup stock. Top with chicken and julienne'd leek over the noodle. Serve hot!
You can change the quantity of shoyu soup base you add depending on how strong you like it ;-) You can also add just boiled water to the shio soup base!