Prepare the steak (10 minutes): Season the sirloin strips with salt and pepper. Heat 1 tablespoon olive oil in a large skillet or Dutch oven over medium-high heat. Sear the steak for 2–3 minutes per side until browned but not fully cooked. Remove from the pan and set aside.
Cook the vegetables (15 minutes): Add the remaining tablespoon olive oil to the pan. Sauté the onion until softened, about 5–6 minutes. Add the diced potatoes and cook another 5–7 minutes, stirring occasionally, until lightly golden. Stir in the garlic and cook 1 minute until fragrant.
Build the Pizzaiola sauce (20 minutes): Pour in the white wine (if using) and allow it to reduce for 2–3 minutes. Add the crushed tomatoes, oregano, and basil. Season with salt and pepper. Cover and simmer gently for 15–20 minutes, or until the potatoes are tender.
Finish the dish (5 minutes): Stir in the peas and return the steak to the pan. Simmer on low heat for about 5 minutes, or until the steak is cooked through and the flavors are well blended.
Serve: Garnish with chopped fresh parsley. Serve warm with crusty Italian bread, polenta, or over rice for a complete rustic Italian meal.