Roast Beef Tenderloin with Caramelized Onion and Mushroom Stuffing

Roast Beef Tenderloin with Caramelized Onion and Mushroom Stuffing was pinched from <a href="https://www.americastestkitchen.com/recipes/3181-roast-beef-tenderloin-with-caramelized-onion-and-mushroom-stuffing?sqn=9RJX%2F5wR0TzxQqzDS8t7HZFln5QrmftjeV12H8yXVdA%3D%0A" target="_blank" rel="noopener">www.americastestkitchen.com.</a>

"Beef tenderloin is perfect holiday fare. Add a rich stuffing and you've got the ultimate main course—at least in theory...."

INGREDIENTS
8 ounces cremini mushrooms, cleaned, stems trimmed and broken into rough pieces
1/2 tablespoon unsalted butter
1 1/2 teaspoons olive oil
1 medium onion, halved and sliced 1/4 inch thick
1/4 teaspoon table salt
⅛ teaspoon ground black pepper
1 medium clove garlic, minced or pressed through garlic press (about 1 teaspoon)
1/2 cup Madeira or sweet Marsala wine
BEEF ROAST
1 beef tenderloin center-cut Châteaubriand, 2 to 3 pounds, trimmed of fat and silver skin
Kosher salt and ground black pepper
1/2 cup lightly packed baby spinach
3 tablespoons olive oil
HERB BUTTER
4 tablespoons unsalted butter, softened
1 tablespoon chopped fresh parsley leaves
3/4 teaspoon chopped fresh thyme leaves
1 medium clove garlic, minced or pressed through garlic press (about 1 teaspoon)
1 tablespoon whole grain mustard
⅛ teaspoon table salt
⅛ teaspoon ground black pepper
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