Preheat your grill to medium-high. Place the wine, rosemary or thyme, and coarsely cracked pepper in a small pot set over medium-high heat. Bring to a boil and boil until the wine is reduced by half, then whisk in the stock/flour mixture. Return to a boil, and boil 2 to 3 minutes. Stir in the blue cheese, season with salt and pepper, then cover and reserve over low heat until the steaks are cooked.
Brush the steaks with the oil and season with salt and pepper. Grill for 2 to 3 minutes per side for rare; 3 to 4 minutes per side for medium rare; or, 4 to 5 minutes per side for medium to medium-well. Plate the steaks, top with the sauce and serve.
Recipe Options: Instead of top sirloin medallions, use another tender steak in this recipe, such as rib-eye or strip loin medallions. Instead of red wine, try an equal amount of port in the sauce. Instead of black pepper, use one or two teaspoons of green peppercorns in the sauce, left whole. Green peppercorns are available in jars or cans in the same aisle where pickles are sold.