Place 250 g thinly sliced pork in a bowl and sprinkle with 1 pinch salt and 1 tbsp all-purpose flour. Mix until the pork has a thin, even coat.
Heat a frying pan on medium and add 1 tsp cooking oil. Once hot, add the pork and arrange it in a single layer. Fry until both sides are lightly golden. Once done, transfer the pork to a plate and set aside for later.
Using the same pan, add 3 tbsp mirin, 2 tsp sugar, 1 tsp dashi granules and 120 ml water. Mix well until the sugar and dashi granules have dissolved, then add 2 fresh shiitake mushroom, ½ yellow onions and 1 Japanese leek (naganegi). Simmer until the onions have softened.
Add the pork back to the pan and drizzle 2 tbsp Japanese light soy sauce (usukuchi shoyu). Mix to evenly disperse.
Separate 3 pasteurized egg so that the whites and yolks are in separate bowls. Lightly whisk the whites and pour them around the pan. Cover with a lid and steam the egg for 1 minute.
After 1 minute, whisk the yolks and pour them around the pan. Continue to cook until the yolks are cooked to your liking (cover with a lid if you don't like runny yolks).
Dish up 2 portions cooked Japanese short-grain rice and divide the contents of the pan over the top. Drizzle any leftover sauce from the pan and garnish with broccoli sprouts, finely chopped green onions and red pickled ginger (benishoga) (optional).