Generously season the entire beef brisket with salt on all sides.
Heat vegetable oil in a pan until smoking hot, then quickly sear all outer surfaces of the beef to create a deep Maillard reaction.
Place the seared beef into a ziplock bag and seal tightly.
Cook sous-vide at a consistent temperature of 60°C (between 55–65°C) for 2 hours using a sous-vide machine or by maintaining water temperature in a pot.
After cooking, remove the beef from the ziplock bag, wrap it in plastic wrap, and chill in the refrigerator for 3 hours.
Wipe excess oil from the pan used for searing, then sauté minced onion and garlic for 7–8 minutes until translucent.
Add soju, mirin, and premium soy sauce to the sautéed onion mixture and simmer until alcohol evaporates, completing the onion soy sauce.
In a bowl, mix plain yogurt, mayonnaise, and lemon juice thoroughly to make the white sauce.
Remove the chilled roast beef from the refrigerator and slice it as thinly as possible using a knife.
Place rice in a bowl, stack the thinly sliced roast beef in a volcano shape, drizzle with soy sauce and white sauce, then top with a raw egg yolk to finish.
Season the beef cut with salt and sear all sides over high heat in a pan.
Place the beef in a ziplock bag and sous-vide at 60°C for 2 hours, then chill in the refrigerator for 3 hours.
Use the same pan to cook onions, garlic, soju, mirin, and soy sauce into a sauce, while preparing the yogurt sauce.
Slice the chilled beef thinly and arrange it over rice, then top with both sauces and a raw egg yolk.
Cooking tips 💡
Using beef brisket from the rear leg—like the original Japanese restaurants—offers great value; ribeye or tenderloin will yield even more tenderness.
Chill the beef thoroughly in the refrigerator to ensure it’s cold, which makes slicing it thinly with a knife much easier at home.
Without a sous-vide machine, use a pot with a thermometer and adjust the heat to maintain a steady temperature between 55–65°C.
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