2Separate the enoki mushrooms into bite-sized bundles.
3Wrap each enoki mushroom bundle tightly with a slice of beef.
4Prepare the sauce by combining 1/4 cup water, 3 tablespoons of soy sauce, 1 tablespoon of brown sugar, and 2 teaspoons of black pepper and seasoning in a bowl.
5Stir the sauce until well combined.
6Sauté the sliced onion in a pan until translucent.
7Add the enoki beef rolls to the pan with the sautéed onions.
8Pour the prepared sauce over the enoki beef rolls.
9Simmer the rolls with the sauce for 3 minutes, covering the pan with a lid.
10Pour the whisked egg (2 eggs) over the cooking beef rolls.