Preheat oven
to 350ºF.
In a large frying pan over
medium-high heat, sauté the onions and mushrooms until tender;
remove from heat an let cool.
In a large
bowl, mix together the spinach, feta cheese, egg, bread crumbs, red pepper, and
onion/mushroom mixture.
Sprinkle the
flank steak with garlic
powder, salt, and pepper. Spread and press the stuffing mixture onto the flank steak to
approximately 1/2 to 1 inch from the border, all the way around.
Begin rolling up
the flank steak with the edge closest to you and roll away from you (the steak should
be rolled parallel to the grain so that once you cut into the steak, you are
cutting against the grain). Once rolled, tie the flank steak roll up with cooking string
every 2 inches or so. Sprinkle the roll with salt and pepper.
In an
oven-proof skillet, heat approximately 1 tablespoon of vegetable oil on medium to
medium-high heat. Once hot, place the roll in the pan and sear each side of the
roll, approximately 2 to 3 minutes per side.
Once the
stuffed flank steak roll is seared on all sides, place the
skillet with the steak in your preheated oven and bake for approximately 20 to 40 minutes (depending on
the size of the roll) until flank steak is
medium rare or until the internal temperature reaches desired temperature on
your
meat thermometer (see below). NOTE: This steak
is best cooked rare to medium rare.
Once cooked,
remove the stuffed flank steak from the over and place on a separate plate.
Cover with aluminum foil and let rest for approximately 5 minutes before
cutting.
While the steak is resting, place the same cooking skillet back on
the stove on medium-high heat and add approximately 1 cup of beef broth.
Continue cooking until the broth has reduced by 1/2. Turn off the heat and
allow broth to cool (at least until the bubbling stops). Add tablespoons of butter, one
at a time, and stir continuously until each tablespoon of butter is melted before adding more.
Continue to add butter and stir until all the butter is incorporated.
Slice the
rested flank steak into individual rolls and place on a serving platter. Drizzle the rolls with the
prepared beef broth sauce and serve.
