Nothing fancy, just season the steak with salt and pepper. Heat oil and butter in a pan, fry steak over the high heat. When both sides are brown, lower the heat and cook depends how you like it.
For the sauce, Heat 2 tablespoon olive oil, fry red onion (shallots) over low heat, then discard the shallots. Then fry garlic (if desired), drizzle with 2 tablespoon red wine, 1 tablespoon light soy sauce, stock (or water), salt and pepper to taste, and thicken with little flour.
Place the sauce on top of the steak. In here, I served it with Baked Creamy Mashed Potato, and blanched broccoli.