Place the spice seeds in a spice grinder and crush to a fine powder. Alternatively, use a pestle and mortar. Tip into a bowl and mix together with the paprika, lemon juice, oil, garlic and parsley, then season with salt and pepper.
Add the pork and stir until well coated. Cover and leave to marinate in the refrigerator for at least 2 hours and preferably overnight.
Thread the pork on to 15 metal skewers. Heat a griddle pan until smoking hot, then add the skewers and cook for 10 minutes, turning frequently, until charred and just cooked through. Serve immediately scattered with extra parsley.