Ingredients

1 (10 ounce) package frozen chopped spinach (thawed, drained and squeezed dry)
1/3 cup finely chopped red onion
1/3 cup chopped pickled pepperonis peppers
2 tablespoons dried breadcrumb
1/4 teaspoon garlic powder (I prefer 1-2 cloves minced fresh)
1/4 teaspoon salt
1 (1 1/2 lb) flank steak
1 (14 1/2 ounce) can beef broth
1/2 cup dry red wine
1/2 cup water
1/2 teaspoon dried oregano

Directions

Combine first 6 ingredients and set aside.Trim fat from steak.Cut horizontally through center of steak, cutting to, but not through, the other side and open flat, like a book; place between 2 sheets of heavy-duty plastic wrap and flatten to an even thickness using a meat mallet or rolling pin.

Spread spinach mixture over steak, leaving a 1-inch margin around outside edges and roll up, jelly-roll fashion, starting with short side; secure with heavy string at 2-inch intervals.

Coat a large Dutch oven with cooking spray and heat at medium-high until hot (I drizzle the pan with olive oil, rather than using cooking spray).Add steak, browning well on all sides; add broth, wine, water, and oregano and bring to a boil.

Cover, reduce heat and simmer 1 hour and 30 minutes, or until tender, turning meat once; add additional water during cooking if necessary.Remove string and cut steak into 8 slices; serve with cooking liquid.