Mix rice vinegar, soy sauce, sugar, ketchup, and apple cider vinegar in a medium mixing bowl and stir until well combined.
Place the pork in the marinade, cover the bowl, and let it marinate in the fridge for at least one to two hours.
Mix rice vinegar, soy sauce, sugar, ketchup, and apple cider vinegar in a medium mixing bowl and stir until well combined.
Place the pork in the marinade, cover the bowl, and let it marinate in the fridge for at least one to two hours.