Grilled Cajun-Style Halibut

Based on https://kalynskitchen.com/recipe-for-grilled-halibut-with/, but with a few of my own tweaks.

Ingredients

•  Halibut (I use thick fillets) - this recipe is good for about 4 peoples' worth... adjust quantities as necessary
• Olive oil
• The spice rub:
• 3/4 tsp garlic powder
• 1/2 tsp onion powder
• 1/2 tsp ground cumin
• 1/2 tsp chili powder
• 1/2 tsp sumac (or substitute with lemon zest)
• 1/2 tsp salt
• 1/2 tsp paprika
• pinch of cayenne (optional)
• Optional: Mango Salsa for serving

Method

1. Heat the grill to very high temperature
2. Dry the fish fillets, but only if you're less lazy than I am
3. Drizzle some olive oil over the fillets and rub to coat them
4. Sprinkle "a generous quantity" of the rub on each piece of fish and rub to coat more-or-less evenly on both sides
5. Put the fillets non-skin side down diagonally on the grill and immediately lower flame to medium-low setting. Close the lid to keep in the heat.
6. Cook about 3 mins (2 for thinner fillets) then rotate the pieces 90 degrees for fancy criss cross grill marks. Cook another 2-3 minutes with the lid down.
7. Carefully flip the fillets (I use 2 spatulas) so that the skin side is down. Cook another 3-5 minutes depending on the thickness of your fillets. (Lid down - make sure the temperature doesn't drop too low). Total cooking time should typically be 8-10 minutes, depending on thickness. Don't overcook - remember it will keep cooking a little when removed from grill.
8. Carefully lift the fillets from the grill - now that the skin side is down, you don't have to worry so much about losing fish if it is sticking.
9. Very nice served with a fruity cilantro-y fresh salsa (mango is best)