1/3 cup (80ml) dashi, or 1/3 cup (80ml) water mixed with 3/4 teaspoon Hondashi
1 tablespoon (15ml) soy sauce
1 tablespoon (15ml) sake
2 teaspoons (8g) sugar
2 teaspoons (10ml) mirin
4 ounces thinly sliced yellow onion (115g; about 1/2 medium onion), optional
1 leftover Japanese fried chicken or pork cutlet, cut crosswise into 1/2-inch strips
2 large eggs
2 scallions, white and light green parts only, thinly sliced, plus more for garnish
Steamed white or brown rice, for serving
Combine dashi, soy sauce, sake, sugar, and mirin in a small saucepan or donburi pan and bring to a simmer over medium heat.
If using onion, add to broth and simmer until tender, about 5 minutes.
Add sliced fried cutlet and let simmer for 1 minute.
Meanwhile, beat together eggs and scallions in a small bowl.
Pour egg mixture on top of cutlet and around broth. Cover and cook until eggs are as set as you’d like them, about 1 minute for very soft or 2 minutes for medium.
Slide broth, egg, and chicken out on top of a bowl of rice. Sprinkle with scallions and serve.