Cook the rice and keep warm until serving.
Season the pork loin with salt and pepper. Dredge in flour, dip in beaten eggs, and then coat with panko breadcrumbs.
Heat the oil in a deep skillet or pot. Fry the pork until golden brown on both sides. Drain on paper towels and slice into thin strips.
Thinly slice the onion. In a skillet, sauté the onion in the dashi stock, soy sauce, mirin, and sugar mixture until softened.
Lightly beat one egg and pour it over the hot onion mixture. Cook for 1-2 minutes, or until the egg is slightly set.
Divide the rice into bowls. Top with the sliced katsu and pour the onion-egg sauce over it.
Garnish with chopped green onions and serve immediately.
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