Preheat the oven to 180°C (350°F).

Place the cod fillet on a baking sheet lined with parchment paper.

Season with salt, pepper, and herbs. Top with lemon slices.

On a separate part of the baking sheet, place the bone marrow bones (cut side up) and season with salt. Bake for 12-15 minutes or until the fish is cooked through and flakes easily with a fork, and bone marrow is soft and cooked through.

Scoop out the bone marrow and serve it alongside the baked cod.