Beef Sukiyaki (Japanese hot pot)

Ingredients

• 2 cups water
• 3/4 cup soy sauce
• 1/4 cup mirin
• 1/4 cup sake
• 1/4 cup sugar
• beef Thinly sliced, well marbled
• napa cabbage chopped
• onions sliced
• green onions cut on the bias
• fresh shiitake mushrooms stems removed, left whole or halved
• enoki mushrooms bottoms removed and cleaned
• bean sprouts
• firm tofu sliced
• udon noodles or soba noodles
• beaten egg for dipping, optional