If using steak for pizzaiola sauce, first butterfly the steak by slicing it in half horizontally and stopping just before cutting all of the way through.
4 steaks
Unfold the steak and pound it out with a meat tenderizer until it is flat but not overly thin. Cut away the silver skin if the steak has one. Generously season the steaks with salt and pepper.
½ teaspoon salt, ½ teaspoon pepper
Heat olive oil in a pan over medium-high heat and sear the steak until browned, 3 minutes on each side. Set the steak aside on a plate after browning.
4 Tablespoons olive oil
In the same skillet, without cleaning, add more olive oil. Add garlic, onion, and bell peppers, and cook until they soften.
1 teaspoon minced garlic, 1 onion, 2 bell peppers
Add tomato sauce, red pepper flakes, Italian seasoning, and water. Stir.
16 oz. tomato sauce, 1 Tablespoon Italian seasoning, ¼ teaspoon red pepper flakes, ¾ cup water
Bring to a simmer, then add steaks back to the skillet. Simmer for 15 minutes on each side.
Transfer steaks to a cutting board and let them rest for 5 minutes. Allow the sauce to continue to simmer while the steaks rest, until it begins to thicken.
Slice steaks thinly against the grain and serve with sauce over top, along with parsley and cheese if desired.
1 cup shredded cheese, 2 Tablespoons fresh parsley