Mix ketchup, worcestershire, oyster sauce, miso, and sugar until smooth. Set aside.
Trim fat from pork and cut into 6 pieces. Pound each between plastic wrap to 1/4-inch thick.
Sprinkle both sides generously with salt, about 1/2 tsp per cutlet. Layer between parchment and refrigerate 2-4 hours.
Remove pork from fridge and bring to room temperature.
Set up three shallow bowls with flour, beaten eggs, and panko.
Dip each cutlet in flour, then eggs, then panko, pressing firmly to coat completely.
Heat 3 inches of oil in heavy pan to 335F.
Fry 2-3 cutlets at a time for 3 minutes per side until golden brown and internal temperature reaches 145F.
Transfer to wire rack and repeat with remaining cutlets.
Rest 2 minutes, then slice into strips.
Serve over rice with tonkatsu sauce, mac salad, and side salad.