Preparation: Preheat your oven to 450°F (230°C). Place the marrow bones, cut side up, on a baking sheet lined with foil or parchment paper for easier cleanup.

Season: Sprinkle the sea salt evenly over the cut surfaces of the marrow bones.

Roast: Place the baking sheet in the preheated oven and roast for 15 to 20 minutes, or until the marrow is soft, has begun to separate from the bone, and is lightly bubbling. The exact time will depend on the size of the bones.

Serve: Allow the bones to cool for a few minutes. The marrow can be scooped out with a small spoon or knife and enjoyed as is, savoring its rich and buttery flavor.