Make Dashi broth with Katsuobushi bonito flakes according to the Dashi recipe. Or you can use an instant Dashi.
Slice green onion very thinly. Cut tomato into 8 wedges. Lightly beat eggs in a small bowl. Set all aside.
Dissolve Miso Paste in the hot Dashi broth. Add tomatoes and cook for 2-3 minutes without boiling. Then add eggs in a swirling motion. Finally add green onions.