In a bowl, combine soy sauce, mirin, sake, and sugar. Mix until sugar dissolves.
Heat a sukiyaki pot or large shallow pan over medium-high heat. Add beef fat or vegetable oil and melt it. Add a few slices of beef and sear quickly until browned.
Pour a portion of the sukiyaki sauce over the beef. Arrange napa cabbage, leek, shiitake mushrooms, enoki mushrooms, tofu, and shirataki noodles around the beef.
Cover the pot and simmer for about 5-7 minutes, or until vegetables are tender. Add more sukiyaki sauce as needed during cooking.
Once cooked, add watercress and let it wilt briefly. Crack fresh eggs into individual small bowls to serve as a dipping sauce.
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