Steps

1. Thinly slice 1/2 onion and then finely mince.
   🕒 01:07
2. Mix a little salad oil into the minced onion, cover with plastic wrap, and microwave.
   🕒 02:10
3. Remove plastic wrap, microwave again to evaporate excess moisture from the onion.
   🕒 03:05
4. Take 1 tbsp of the heated onion and set aside for the sauce.
   🕒 03:31
5. Add 20g dried breadcrumbs and 2 tbsp milk to the remaining hot onion, mix well, and let cool slightly.
   🕒 03:47
6. Once slightly cooled, add 1/2 beaten egg and mix.
   🕒 04:17
7. Add 1/3 tsp salt and 1 tbsp Worcestershire sauce to the chilled 300g ground mixed meat. Mix quickly by crushing with your hands to avoid transferring heat.
   🕒 04:50
8. Add the mixture of prepared onion, breadcrumbs, milk, and egg to the ground mixed meat and quickly knead until well combined.
   🕒 05:38
9. Lightly grease your hands with salad oil, divide the mixture into 2 portions, and shape into round patties.
   🕒 06:21
10. Degas the shaped patties at least 30 times, creating a smooth, glossy surface. Do not indent the center; flatten to a thickness of about 2cm. [Here's the tip!] Indenting the center makes the meat juice escape more easily, so by not indenting it, you trap the juice inside.
    🕒 06:48
11. Heat salad oil in a frying pan over medium heat, add the shaped hamburg steaks, and cook until a golden-brown crust forms on one side.
    🕒 08:14
12. Flip the hamburg steaks using the side of the frying pan and cook until golden brown on the other side. [Here's the tip!] Flipping using the side of the pan prevents meat juice from leaking out.
    🕒 09:16
13. Once both sides of the hamburg steaks are browned, add 3 tbsp water, cover with a lid, and steam.
    🕒 09:41
14. Turn off the heat and let it cook through with residual heat for 1 minute while covered. [Here's the tip!] Over-steaming can cause the flavor to escape and create a crumbly texture, so turn off the heat before that happens.
    🕒 10:07
15. Transfer the cooked hamburg steaks to a plate and cover with plastic wrap to keep them warm.
    🕒 11:13
16. Add 2 tbsp sake, the reserved 1 tbsp onion, 2 tbsp tomato ketchup, and 3 tbsp Worcestershire sauce to the remaining flavorful drippings in the frying pan and mix.
    🕒 11:41
17. Simmer the sauce until it thickens.
    🕒 12:11
18. After turning off the heat, add 10g butter and melt and mix with the residual heat to finish the sauce.
    🕒 12:30
19. Pour the prepared sauce generously over the hamburg steaks on the plate to serve.
    🕒 13:13