[header] How to cook bone marrow [title] Preheat the oven to 450 ° f (232 ° c). [step] Adjust your oven rack so it's in the center of the oven. [title] Arrange 2 to 3 pounds (0.9 to 1.4 kg) of marrow bones on a sheet. 
[step] Get out beef marrow bones and place them on a rimmed baking sheet such as a jellyroll pan. [substeps] Spread the bones in a single layer.