1. In a small bowl, combine salt, pepper, oregano, garlic, and 1 Tbsp. of the oil, mixing together to form a paste. Rub the mixture on both sides of the steaks.
2. In a large nonstick skillet, heat 1 Tbsp. of the oil over medium-high heat. Add steaks and cook until browned, 2 minutes per side. Remove to a plate and set aside.
3. Add remaining 1 Tbsp. oil to same skillet and reduce heat to medium. Add sliced onions to skillet, stirring frequently to scrape up browned bits on the bottom. Cook until onions are softened and golden, about 10 minutes. Stir in apple cider vinegar.
4. Slice steak into thin strips and return meat and any accumulated juices to skillet with onions. Stir to heat through. Serve immediately.
Source: Hannaford fresh Magazine, May - June 2009