Beef Wellington Recipe

Beef Wellington Recipe Ingredients: 1 1/2 to 2 pounds (680 to 900g) beef tenderloin, center-cut, trimmed Salt and freshly ground black pepper 2 tablespoons olive oil 1 tablespoon Dijon mustard 8 ounces (225g) cremini mushrooms, finely chopped 2 shallots, finely chopped 2 cloves garlic, minced 2 tablespoons unsalted butter 1/4 cup dry white wine or beef broth 1 tablespoon chopped fresh thyme leaves 1/2 teaspoon salt 1/4 teaspoon freshly ground black pepper 8-10 slices prosciutto or Parma ham 1 sheet (about 9x9 inches or 23x23 cm) puff pastry, thawed if frozen 1 egg, beaten (for egg wash)