Ah, easy and successful. There's nothing better.
1.) To serve two people, I took four cubes -- the equivalent of 4 tablespoons -- of frozen pesto out to thaw. You could use ready-made pesto.
2.) I baked it, covered, over a half-pound fish at 350 degrees for 25 minutes. I bought a kebab at Bloomingfoods because it was cheaper than the other fish they had out. It was a mix of mahi-mahi, cod, and tuna, I think.
3.) I served it on top of spelt egg noodles, with a basic side salad.
A note: Pesto works well with mild meats and fish; its flavor is so intense it will overpower or conflict with a fish like salmon.