Put everything from Step 1 and ● ingredients into a bowl and mix (you don't have to knead it too much).
Heat some oil in a frying pan on high heat. While it is heating up, divide the mixture into 5, and form round patties (the patties will be quite soft).
Cook over high heat for 1-2 minutes, and then flip over. Cook for another 10 minutes on a low to medium heat.
Put the ingredients for the sauce into a small saucepan, and start heating. Once it has reduced and thickened, the sauce is ready.
Serve the hamburger patty on a plate, and pour the sauce over it. Done.
Story Behind this Recipe
I perfected this recipe over many years for my daughter who didn't like hamburgers! Now, she says "it's better than restaurants". It's all down to the yakiniku sauce though.
- I think the flavour of the meat is better if you don't knead the ground meat too much. - The flavour is brought together by the yakiniku sauce, but this burns easily so watch out! - You don't need to fry the onions! - In Step 2, an alternative is to put it all in a plastic bag to mix it up! That way you don't have to dirty your hands.