Here is how I do it when I want good flavor fast:

skinless ling fillets.

Get a stainless steel flat bottom bowl, set on grill. Add butter, parsley, garlic, olive oil to the bowl. Grill should be heating up, this mixture is melting.

Using a brush paint this mixture on one side of the ling fillet, throw it on the hot grill, painted side down. Paint lots of it onto the other side (the up side).

Shut hot grill a minute. There should be flames and smoke from the butter. The little bowl can be on the side by now, it is all melted.

Then with a big spatula (long enough to get all of fillet) flip the fish. Paint topside again with garlic/butter mix. Cook some more, not too much.

Take off, throw rest of butter mixture on fish and eat. Should take about 5 minutes depending on thickness. If the fish cooks too much it could flake and fall through the grill. If this happens start crying because you just ruined dinner, you a$$hole.