Oyakodon (Japanese Chicken and Egg Rice Bowl) Recipe

Combine dashi, sake, soy sauce, and sugar in a 10-inch skillet and bring to a simmer over high heat. Adjust heat to maintain a strong simmer. Stir in onion and cook, stirring occasionally, until onion is half tender, about 5 minutes. Add chicken pieces and cook, stirring and turning chicken occasionally, until chicken is cooked through and broth has reduced by about half, 5 to 7 minutes for chicken thighs or 3 to 4 minutes for chicken breast. Stir in half of scallions and all of mitsuba (if using), then season broth to taste with more soy sauce or sugar as desired. The sauce should have a balanced sweet-and-salty flavor.