Thinking of cooking a whole fish for a special meal? You've got this. Just follow these simple steps: Preheat your grill or an oven to 450 F. Rub the fish all over with olive oil or soft butter, then season with plenty of salt and pepper. At this point, you can also add herbs or spices for additional flavor. Place the fish on a piece of kitchen foil, then pop it in the oven or onto the grates. Roast until it's cooked through, 15-20 minutes depending on the size. To serve, carefully peel off the skin and run a knife along the backbone to pull away the fillets from each side. Make sure to include the bits around the edges - they're the most tender parts!