Add vinegar, peri peri seasoning, ginger garlic paste, salt, and black pepper to the fish cubes and mix well until evenly coated. Sprinkle the flour over the fish and toss gently. In one bowl, combine panko breadcrumbs, all-purpose flour, and dried parsley. In another bowl, whisk the egg with milk. Dip each piece of fish into the egg mixture, then coat evenly with the breadcrumb mixture. Set aside on a tray. To cook Spicy Fish Nuggets, deep fry in medium-hot oil until golden on all sides, air fry at 180°C for 10–15 minutes flipping halfway, or bake at 200°C for 15–18 minutes until crispy. Serve hot with your favorite dip.