Bone Marrow Horseradish Sauce

1/4 cup beef bone marrow (obtain by roasting beef marrow bones and scooping out the marrow)

1/4 cup grated horseradish root

1/2 cup creme fraiche or sour cream

1 T. mustard

1 t. white wine vinegar

salt and pepper to taste

Combine all ingredients and enjoy! This sauce is great for dipping, or for slathering on your roast beef sandwich or brisket taco.