1.
Mix the oil, orange juice, ginger, cumin, coriander, paprika, salt, and cayenne together in a small bowl to form a paste the consistency of thick salad dressing. This will transform into a gorgeous crust during grilling.
2.
Place the salmon in a glass dish, massage the marinade over the salmon, then cover and refrigerate for 30 minutes.
3.
Preheat a gas grill on high with the lid closed for about 10 minutes, then place the salmon skin-side down, close the lid, and wait 3 minutes.
Check the salmon; the skin should be a little blackened and starting to separate from the pink flesh. Take a deep breath, gather your confidence, slide a grill-safe flipper under the fillet, and flip! Breathe a sigh of relief, close the lid, and wait another 3 minutes.
4.
Remove from the grill and eat like a cave person. I like to include a little piece of the crispy skin with each serving. You know how you could do that? Replace orange juice with lemon or lime. Try the spice rub on shrimp or white fish like cod or tilapia.