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Begin by preparing the demi-glace sauce. Slice the onion. In a pot, sauté the sliced onion in olive oil over medium heat until softened, about 5-7 minutes.

Pour 500 ml of water into the pot with the sautéed onions. Bring to a simmer, then reduce heat to low and let it simmer for 30 minutes.

While the sauce simmers, chop the blocks of Hayashi rice mix. After 30 minutes, add the chopped Hayashi rice mix to the pot. Stir until it melts and is well combined. Continue to simmer for another 10 minutes, stirring occasionally.

In a separate pan, melt some butter over medium heat. Add the maitake and shimeji mushrooms and sauté until tender, about 5-7 minutes. Stir the sautéed mushrooms into the demi-glace sauce. Set the sauce aside.

Prepare the hamburger patties. In a large bowl, combine the ground beef, ground pork, cooled sautéed diced onion, bread crumbs, salt, pepper, milk, ground nutmeg, and 2 eggs. Mix thoroughly until all ingredients are well incorporated.

Cut the mozzarella cheese into thick slices. Take a portion of the meat mixture and form it around a slice of mozzarella cheese, ensuring the cheese is fully enclosed. Form the patty into an oval shape, tossing it back and forth a few times to remove any air.

Heat a pan over medium-high heat and add butter to coat the bottom. Sear each side of the patties for about 2 minutes per side until browned.

Reduce the heat to low. Pour a little bit of sake into the pan, then cover with a lid. Simmer the patties for approximately 8 minutes, or longer depending on their thickness, until cooked through.

Prepare the omelettes. For each serving, heat a pan to medium-high heat and add butter to coat. Pour 3 mixed eggs onto the pan. Shake the pan back and forth while stirring the eggs in a circular pattern (using chopsticks is recommended).

Once the eggs reach your desired gooeyness, peel one side of the omelette towards the other. Gently move the pan up and down a couple of times, then flip the omelette over onto a plate.

To assemble, place a mound of cooked rice on a plate. Top the rice with a cooked hamburger patty. Place the prepared omelette on top of the patty and rice. Finally, pour a desired amount of the demi-glace sauce over everything.


Begin by preparing the demi-glace sauce. Slice the onion. In a pot, sauté the sliced onion in olive oil over medium heat until softened, about 5-7 minutes.

Pour 500 ml of water into the pot with the sautéed onions. Bring to a simmer, then reduce heat to low and let it simmer for 30 minutes.

While the sauce simmers, chop the blocks of Hayashi rice mix. After 30 minutes, add the chopped Hayashi rice mix to the pot. Stir until it melts and is well combined. Continue to simmer for another 10 minutes, stirring occasionally.

In a separate pan, melt some butter over medium heat. Add the maitake and shimeji mushrooms and sauté until tender, about 5-7 minutes. Stir the sautéed mushrooms into the demi-glace sauce. Set the sauce aside.

Prepare the hamburger patties. In a large bowl, combine the ground beef, ground pork, cooled sautéed diced onion, bread crumbs, salt, pepper, milk, ground nutmeg, and 2 eggs. Mix thoroughly until all ingredients are well incorporated.

Cut the mozzarella cheese into thick slices. Take a portion of the meat mixture and form it around a slice of mozzarella cheese, ensuring the cheese is fully enclosed. Form the patty into an oval shape, tossing it back and forth a few times to remove any air.

Heat a pan over medium-high heat and add butter to coat the bottom. Sear each side of the patties for about 2 minutes per side until browned.

Reduce the heat to low. Pour a little bit of sake into the pan, then cover with a lid. Simmer the patties for approximately 8 minutes, or longer depending on their thickness, until cooked through.

Prepare the omelettes. For each serving, heat a pan to medium-high heat and add butter to coat. Pour 3 mixed eggs onto the pan. Shake the pan back and forth while stirring the eggs in a circular pattern (using chopsticks is recommended).

Once the eggs reach your desired gooeyness, peel one side of the omelette towards the other. Gently move the pan up and down a couple of times, then flip the omelette over onto a plate.

To assemble, place a mound of cooked rice on a plate. Top the rice with a cooked hamburger patty. Place the prepared omelette on top of the patty and rice. Finally, pour a desired amount of the demi-glace sauce over everything.
