Marinate meat with Sake+soysauce+drained homemade dashi ( katsuobushi, sugar, water, vinegar) Cook your onsen tamago now
Drained meat and use pour the juice into pan to almost boiled or boiled, then add onion ( 大火cover the lid if using less marinating sauce)
When onion soften, add meat in till fully cooked一樣大火
Chop some green onion and serve with egg