If it is difficult to get those noodles, then use "Barilla Capellini No. 1". When you cook pasta in boiling water, just add 1 tbsp of baking soda (1 tbsp baking soda per 1 liter of water). The pasta will turn more Ramen-like, and that's all you need to do. It is quite helpful when you are busy :-)
1. In a frying pan, heat 1tbsp oil and fry garlic and ginger until fragrant. Add ground beef and leek and continue stir frying until no longer pink. Add the ingredient A and fry for a few more minutes. Thicken with katakuriko. Set aside.
For the soup
2. In a cooking pot, add some of cooked ground beef (about 10 to 20 %), green parts of leek (to taste - optional) and pour water and bring to a boil. Once it boils, add the ingredient for soup (weipa or torigara powder, soy sauce, vinegar and sesame paste etc...) and simmer for a few minutes. Remove the green parts of leek (if you put any).
3. Cook the noodles according to its packaging and drain well. Place the boiled noodles into individual serving bowls and pour the soup, then top with ground beef.