Steak and Mushroom Florentine

From Taste of Home.

• Ready In: 30 mins
• Serves: 4

Ingredients

• 1  lb boneless beef sirloin (3/4-inch thick) or 1  lb top round steak (3/4-inch thick)
• 2  tablespoons  vegetable oil
• 1  small onion, sliced
• 4  cups  fresh  Baby Spinach
• 1 (10 3/4ounce) can  condensed cream of mushroom soup, undiluted
• 1  cup water
• 1  large tomatoes, thickly sliced
•  fresh ground black pepper

Directions

1. Slice beef into very thin strips. Heat 1 tablespoon oil in a medium nonstick skillet over medium-high heat. Add beef and cook until browned and juices evaporate, stirring often.
2. Remove beef from skillet; set aside.
3. In same skillet, heat remaining oil over medium heat. Add onion and cook until crisp-tender.
4. Add spinach and cook just until spinach is wilted.
5. Add soup and water. Bring to a boil.
6. Return beef to skillet and heat through. Serve beef mixture over tomato. Season to taste with pepper.