Preheat the broiler. In a large skillet, heat 1 tbsp.EVOO over med-high heat. Add the onion and he'll peppers; season with salt and pepper. Cook, stirring, until tender, about 4 mins

Meanwhile whisk together the vinegar,oregano and remaining 2 tbsp EVOO. Season with salt and pepper.

Season the steak with salt and pepper and broil, turning once for about 8 minutes for medium-rare. While the steak is broiling, toast the rolls on a baking sheet on the bottom rack for 3 minutes.

Let the steak read for 5 minutes, then thinly sliced. Toss with the onion and peppers, then the dressing. Serve the pepper steak in the rolls.