Preheat oven to 400ºF.
Place a medium skillet over medium-high heat with 2 turns of the pan of EVOO, about 2 tablespoons. Add the steak and cook until brown, 5-6 minutes. Add the onion and garlic and cook until the onion is tender, 3-4 minutes. Sprinkle the flour over the skillet, cook about 1 minute, then add the beef stock, Worcestershire sauce and peas. Cook until thickened and the peas have heated through, about 2-3 minutes. Season with salt and pepper, and remove from heat to cool slightly.