Ingredients
The following ingredients have 11 Servings
- One (6-pound) whole beef tenderloin
- 4 tablespoons extra-virgin olive oil
- Kosher salt and freshly ground black pepper
- 2 1/2 pounds large Vidalia or other sweet onions (about 5 (cut into slices 1/4-inch [6-mm] thick))
- 2 fresh thyme sprigs
- 1 tablespoon balsamic vinegar
- 1/2 cup Madeira (may substitute tawny port) (or more as needed)
- 3 cups beef stock or reduced-sodium beef broth
- 2 to 3 tablespoons beef demi-glace
- 1 tablespoon red wine vinegar
- Kosher salt and freshly ground black pepper
- 2 tablespoons (1 oz) unsalted butter (at room temperature)
- 2 tablespoons all-purpose flour
