Set out steak at least 30 minutes before cooking to bring them to room temperature. Cut into bite-size pieces and sprinkle with salt and pepper.

In a cast iron skillet, heat olive oil and butter over medium heat until the skillet is hot. Add meat pieces, working in batches to avoid overcrowding, and sear on medium-high heat. Toss just enough to sear on all sides and then remove from the skillet.

Add the red wine vinegar to the skillet to deglaze the pan. Add the Worcestershire sauce and simmer for 30 seconds to reduce the sauce.

Add the diced onions and peppers to the pan, as well as the garlic and Italian seasoning. Saute on medium heat for 5-8 minutes, until the onions have softened and the peppers are tender crisp.

Return the steak to the pan and heat through.

Garnish with a sprinkle of fresh herbs, if desired, and serve immediately.