Thinly slice chicken thighs and onion.
In a small bowl, beat eggs until loosely combined.
In another bowl, combine dashi, mirin, sake, soy sauce and monkfruit erythritol sweetener. Transfer to a saucepan.
Add chicken and onion to the saucepan and bring mixture to a simmer over high heat.
Reduce heat to low. Cover and cook for 5-8 minutes or until the chicken is cooked.
Taste the broth and adjust seasoning if necessary. It should be savory and slightly sweet.
Slowly drizzle the beaten egg over the chicken and onion. Cover and cook until egg is done to your liking.
Serve immediately over steamed rice. Top with chopped spring onion and shichimi togarashi. Enjoy!