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