Add the chopped green onion and grated ginger to the ground pork. Mix well until the mixture becomes sticky. In a separate bowl, combine the soy sauce, mirin, sake, and sugar.

Shape the pork mixture into logs. Heat oil in a skillet and cook the tsukune until cooked through.

Pour the sauce mixture into the skillet with the tsukune. Simmer and turn the tsukune to coat them in the sauce until it thickens.

Insert skewers into the tsukune, plate, and serve! Enjoy by dipping in egg yolk.