Preheat oven to 350, line a rimmed cookie sheet with parchment paper, season the fish, make the paste, put the paste into the cavity and a few slits cut into the top of the fish. Add lemon slices and fresh herbs as desired. Cook until just done, about 12 - 18 minutes depending on oven temp and size of the fish. Let it rest.
Prep Time 10 minutes mins
Cook Time 18 minutes mins
Total Time 28 minutes mins
Fresh fish is delicate. The window between undercooked and overcooked is narrow. Check the thickest part of the fish at the 10-minute mark and proceed in 3 - 5-minute increments. You want the fish to separate easily into segments when you poke it with a fork. I served this with oven roasted asparagus/red onions and fresh bread. Since the oven was already on, I threw the veggies in ahead of the fish. Put parchment paper on a cookie sheet, put the veggies on, douse with olive oil (a little or a lot), season with kosher salt and pepper. Roast at 350 about 30 minutes.