Combine the water and hondashi and bring to a boil.
While the water boils, lay the beef onto a serving plate. Set aside.
Prepare the Sauces
Stir together ponzu ingredients and set aside.
Whisk all ingredients for the Goma Dare together. Thin to desired consistency with water (I like to be able to drizzle it). Set aside.
Separate the dipping sauces between two sets of individual serving bowls and set aside (one bowl of each sauce per person).
To Serve
Once the broth boils, add the cabbage, mushrooms, carrots, and green onions.
Transfer the boiling pot of soup to the table and use chopsticks to swirl the meat in the hot broth (it will cook through in seconds). Dip the meat in sauce and enjoy with furikake, if desired. Only cook one piece of meat at a time to prevent overcooking.
Once the meat is cooked, enjoy the remaining broth and vegetables.
Notes
Nutrition using top sirloin: Protein:Energy Ratio: 1.48Nutrition using ribeye: Calories: 588 cal, Carbs: 15g, Fiber: 4g, Fat: 40g, Protein: 45g,Protein:Energy Ratio: 0.88