Season the pork loin slices with salt and pepper. Dredge them first in flour, then dip in the beaten eggs, and finally coat evenly with panko breadcrumbs.
Heat the vegetable oil in a deep skillet or pot over medium-high heat. Fry the breaded pork cutlets until golden brown and cooked through, about 3-4 minutes per side. Transfer them to a paper towel-lined plate to drain excess oil.
In a small saucepan, combine the dashi stock, soy sauce, mirin, and sugar. Bring to a simmer, then add the thinly sliced onion and cook until softened.
Lightly beat the remaining egg and pour it into the simmering onion sauce. Cook over low heat until the egg is softly set, but still slightly runny.
Slice the fried pork cutlets and arrange them on top of the onion and egg mixture. Cook for another 1-2 minutes to allow the flavors to meld.
Serve the Katsu Don hot over a bowl of cooked rice. Garnish with fresh green onions.
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