Place steak between 2 pieces of plastic wrap and pound until it is about ½ inch thick. Season both sides with salt and pepper.
Add olive oil to large skillet over medium-high heat. Add the steaks and sear for about 1 minute per side. Remove the steaks and reduce heat to medium.
Add the onion, cooking for about 5 minutes or until translucent. Add garlic, cooking for an additional 30 seconds. Deglaze with the white wine, scraping up any brown bits.
Stir in the tomatoes, tomato paste and oregano. Reduce to simmer, cooking for 20 minutes. Season with salt and pepper.
Add steaks, cooking to desired doneness, 6-10 minutes depending on your preference.
Notes
While I use sirloin steaks, you can use any steak you prefer. Just don't use beef meant for stewing or slow cooking.
Use a dry white wine you'd be willing to drink like Pinot Grigio or Chardonnay.
If you don't have fresh oregano, you can use dried. Just use ⅓rd (2 tsp) of the amount since it is stronger.
If you like some heat, add ¼ teaspoon of crushed red pepper flakes.