Sprinkle 200 g thinly sliced beef with 1 pinch salt and pepper, and 2 tsp all-purpose flour. Mix well until all the beef is evenly coated.
Heat up a large pan on medium/medium low and add 1 tbsp butter and 1 clove garlic .
Once the butter is melted and the garlic is fragrant, add the beef to the pan and sear on both sides.
Next, add ½ yellow onions to the pan and fry until slightly softened.
Add 1 bell pepper and 4 button mushrooms, mix well and reduce the heat to low.
Sprinkle 1 tsp all-purpose flour over the ingredients in the pan and mix thoroughly.
Hayashi Sauce
Add 2 tbsp tomato ketchup, 4 tbsp red wine and 2 tbsp Worcestershire sauce, mixing between each ingredient.
Finally, add 300 ml beef bouillon and return the heat to medium/medium-high. Stir occasionally.
Once thickened, reduce the heat once more to the lowest heat to keep it warm while frying the rice. Add a lid to prevent further evaporation if necessary.
Garlic Butter Rice
Heat a separate pan on a medium heat and add 1 tsp butter and 1 clove garlic.
Once fragrant, add 2 portions cooked Japanese short-grain rice and stir fry for a few minutes. Sprinkle with 1 tsp fresh parsley and mix until it's distributed throughout the rice.
Dish up the rice onto one side of the serving plates and pour the hayashi beef next to it. Garnish with fresh parsley and enjoy!