Designer and blogger Athena Calderone often makes this whole roast fish for her family on Christmas Day — it makes a dramatic centerpiece for a holiday meal. Like the rest of her menu, it tastes fresh and bright, thanks to a double hit of herbs.
Preheat the oven to 450°F. Put the fish on a parchment paper-lined baking sheet. Make 3 crosswise slashes down to the bone on each side of the fish. Rub with the olive oil and season with salt and pepper. Stuff each slash with one lemon slice and some herbs. Stuff the cavity with the shallot, fennel, garlic and remaining lemon slices and herbs. Roast for about 20 minutes, until the flesh is opaque.
In a medium bowl, mix all of the ingredients. Serve the fish with the salsa verde.