Preheat oven to 350°.
Butterfly the flank steak or have a butcher butterfly it.
Rub cut garlic clove and olive oil on the steak and marinade in the refrigerator for several hours.
Heat 2 Tbsp olive oil, onion, and celery in pan over medium and cook for 2 minutes.
Remove from heat. Add torn bread and water or stock. Let sit for 2 minutes.
Place pan over high heat and cook for 2 minutes, or until most of the liquid has evaporated. Transfer to a bowl.
Add raw ground veal, the egg, salt and pepper. Mix together.
Lay out the steak. Place the veal mixture over one end of the butterflied flank steak. Roll tight. Place seam side down on an oiled pan.
With a sharp knife, gash the top against the grain and rub with a little olive oil.
Bake for 30 minutes at 350°. Let rest 15 minutes. Slice into ½ inch slices.