With a little green veggie on the side (maybe some broccoli), this twist on class meat and potatoes provides a quick, tasty dinner. The steak should marinate at least 30 minutes, which is not included in the preparation time.
Whisk first 6 ingredients together in mixing bowl. Place steaks in shallow glass baking dish and pour marinade over top. Turn several times to coat completely. Refrigerate covered at least 30 minutes.
Heat butter and remaining 2 T. oil in large heavy skillet over medium-high heat. Add potatoes and cook, turning frequently, until golden and crisp, about 10 minutes. Season with salt and pepper and keep warm.
Heat broiler or grill.
Broil steaks about 4 inches from heat 5 minutes (or grill); turn and broil second side 3 minutes for medium-rate. Serve at once with potatoes.