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1 1/4 pounds flank steak

2 bunches fresh spinach, steamed, drained and squeezed

1/4 cup packed fresh flat- leaf parsley leaves, coarsely chopped

1/2 cup mushrooms 

2 tablespoons butter

1/2 cup grated Asiago cheese (4 ounces)

2 tablespoons capers, drained and rinsed

1 tablespoon Worcestershire sauce

1/4 teaspoon crushed red- pepper flakes

4 teaspoons olive oil

2 cloves garlic, minced

Coarse salt and freshly ground pepper


Heat butter and 2 tablespoons olive oil over medium heat. Add mushrooms and 1 clove minced garlic. Sauté until soft, about 5 minutes seasoning with salt and fresh ground pepper about halfway through.

Heat broiler, with rack set 4 inches from heat source. Line a rimmed baking sheet with aluminum foil. Squeeze spinach in a clean kitchen towel (or a double layer of paper towels) to remove as much liquid as possible. Combine spinach, mushrooms, parsley, cheese, capers, Worcestershire sauce, garlic, and red- pepper flakes in a bowl. Season with salt and pepper; toss to combine.


To butterfly steak, lay it on a cutting board with a short side facing you. Using a long knife, slice steak horizontally, leaving one side intact; open up like a book.


Cut several 12-inch pieces of kitchen twine; space evenly underneath steak. Spread spinach mixture down center of meat. Roll steak over mixture, pressing firmly to compact filling; tie twine to secure roll. Cut roll in half crosswise. Place halves, seam side down, on prepared baking sheet; rub with oil, dividing evenly, and season with salt and pepper.


Broil steak until browned on all sides, turning as needed with tongs, 8 to 10 minutes for medium- rare; let rest, covered loosely with aluminum foil, 10 minutes. Remove string;

slice steak 1/2 inch thick

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