In a large pot or a Nabe pot, bring the dashi broth to a gentle simmer over medium heat. Season the broth with tamari, salt, and pepper to taste.
Arrange the thinly sliced beef, cabbage, mushrooms, tofu, carrot, onion, and green onions on separate plates or on a platter.
Once the broth is simmering, each diner can add ingredients of their choice into the pot to cook. Cook the ingredients until they are tender and cooked through. Thinly sliced beef typically cooks quickly, while vegetables and tofu may take a bit longer.
Serve the Nabe hot with the dipping sauce and seasoned rice on the side.