How to Make Maguro Zukedon

 How to Make Maguro Zukedon (serves 1) ??????????? ?????

80~100g Fresh Tuna, Sashimi-grade (2.8~3.5 oz)
1 tbsp Soy Sauce
1 tbsp Mirin or 1 tbsp Sake+1 tsp Sugar
1 tbsp Dashi Stock or 1 tbsp Water+2 pinches of Dashi Powder
½ tsp Sesame Oil
80g Yamaimo - Japanese Mountain Yam (2.8 oz)
8g Kaiware Radish Sprouts or substitute: Garden Cress (0.3 oz)
2 tbsp Spring Onion Leaves, Chopped
Toasted Nori Seaweed
Toasted White Sesame Seeds
Wasabi
160g Steamed Rice (5.6 oz)