Step 1

Preheat oven to 425°F.

Step 2

Line a baking sheet with parchment paper.

Step 3

Spread the bones, marrow side up, on the baking sheet.

Step 4

Bake in the preheated oven for 15-20 minutes or until the marrow in the center of each bone is bubbly and soft all the way through.

Step 5

Let marrow bones cool enough to be handled, then scoop out the marrow into a food processor.

Step 6

Add the softened butter, salt, rosemary or thyme, and fresh parsley to the food processor.

Step 7

Blend until smooth.

Step 8

Use as you would butter and refrigerate leftover.