If you can't buy pork and veal mince, just buy pork mince and beef mince separately and then combine them. The mixture freezes well either cooked or uncooked, so make a batch.
This was a quickly made dish using some leftovers of pulled pork. You could just as easily use cooked chicken strips, pieces of fish, prawns, squid or tofu/tempeh. My recipe for ponzu sauce comes from Genius Kitchen.