Mix the smoked paprika, onion powder, garlic powder, cayenne pepper, dried thyme, dried oregano, freshly ground black pepper and fine sea salt in a small bowl.
Stir together with a spoon or small whisk until well combined.
Pat your chosen protein—fish, chicken, prawns or steak—dry, then coat both sides generously with the seasoning mix.
Heat a cast-iron frying pan over medium–high heat until it just starts to smoke. Add a drizzle of oil or a knob of butter, then lay in the seasoned protein.
Cook for 3–5 minutes on each side, until a dark crust forms and the internal temperature reaches 63°C for fish or 74°C for chicken.
Store any leftover seasoning mix in an airtight container in a cool, dark place for up to six months.