Steak with Blue Cheese Sauce

We totally enjoyed the blue cheese sauce. I'm serving this to my husband's brother and sisters on Valentine's Day.

4 Steaks
1 tablespoon canola or olive oil
1 tablespoon balsamic vinegar
1 teaspoon brown sugar
2 cloves garlic, minced
2 tablespoons crumbled blue cheese
2 tablespoons lowfat buttermilk
Dash Worcestershire sauce
1/2 teaspoon salt
1/4 teaspoon freshly ground black pepper
2 tablespoons fresh chopped parsley leaves

In a small bowl, whisk together the oil, balsamic vinegar, sugar and garlic. Put the steak into a sealable plastic bag with the marinade and let sit for 30 minutes at room temperature or 1 hour in the refrigerator. In the meantime, in a small bowl combine the blue cheese and buttermilk with a fork, mashing until creamy. Stir in the Worcestershire and set aside. Remove the meat from the marinade and season both sides with salt and pepper. Discard the marinade. Cook the meat in a grill pan over medium-high heat for about 3 minutes per side for medium rare. Drizzle steak with blue cheese sauce and sprinkle with parsley.