1. Rinse
the spinach and shake off any excess water. Steam until limp.
Squeeze out the water in the spinach with a spoon. Set aside to
cool.
2. Pound
the flank steak with a meat mallet. Evenly spread on one side
of the steak the crushed garlic, black pepper, sage and Romano
cheese. Evenly spread the spinach on the steak next. Arrange the
proscuitto slices over the entire steak and top with the mozzarella
slices.
3. Begin
with the short side and roll the steak up. Tie the ends and the
middle with thin rope and place on a rack in a roasting pan with the
flap in the up position.
4. Sprinkle the top with rosemary. Bake
in a preheated 350º F oven for
1 hour 15 minutes. Slice, remove the string and serve.