If it is difficult to get those noodles, then use "Barilla Capellini No. 1". When you cook pasta in boiling water, just add 2 to 3 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.Making the beef topping In a frying pan, heat 1 to 2 tbsp oil and fry garlic and ginger until fragrant. Add zha cai, leek and ground beef, continue stir frying until no longer pink. Add the ingredient A and fry for a few more minutes. Set aside.
For the soup
2. In a cooking pot, heat 1 tbsp sesame oil and sichuan peppercorn oil. Fry the garlic and ginger until fragrant and add 1 to 2 tbsp of beef mixture which you made just above and sesame paste. Cook them for a few minutes.
3. Pour water and leek (the green part) and bring it to a boil. Once it boils, add the seasoning for soup (weipa, vinegar and salt.) Simmer for a few minutes. Remove the green parts of leek.
4. 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.