Combine ground beef with finely chopped onion, breadcrumbs, milk, egg, salt, black pepper, and a little nutmeg. Mix gently and shape into thick oval patties. Heat oil in a skillet and sear the patties on both sides until browned. Add a splash of water, cover, and cook gently until the centers are fully cooked and juicy. Prepare a savory sauce with soy sauce, Worcestershire sauce, ketchup, butter, and a little sugar. Simmer until glossy, then coat the beef patties generously. Fill serving bowls with hot Japanese rice and arrange the Hamburg steak on top. Add a soft fried egg, steamed broccoli, or sautéed mushrooms. Spoon extra sauce over everything and garnish with chopped scallions or sesame seeds before serving. - @benditewalker67