Buffalo Style Skirt Steak with Bleu Cheese Sauce


3/4 cup hot sauce (such as Crystal)

1/4 cup butter, melted

2 teaspoons Worcestershire sauce

1/2 teaspoon onion powder

2 pounds skirt steak

Cheese Sauce

2 Tbsp butter

2 Tbsp flour

1 1/2 cups milk

1/3 cup Bleu Cheese crumbles

2 tsp pepper

1 tsp salt

1/4 tsp red pepper flakes (optional)

Steak:  Combine hot sauce, melted butter, Worcestershire sauce, and onion powder in a bowl. Reserve 1/4 cup hot sauce mixture; pour remaining hot sauce mixture in a zip-top plastic bag. Add skirt steak to bag; seal. Marinate at room temperature 20 minutes (don't refrigerate it - the butter will harden). Remove steak from bag; discard marinade in bag. Grill steak until done (about 7-10 minutes). Brush reserved marinade over steak. Serve with bleu cheese sauce, if desired. 

Cheese Sauce: In a medium saucepan, melt the butter over medium-high heat. Add flour, milk and bleu cheese crumbles. Whisk until crumbles melt. Add salt, pepper and red pepper. Stir well, until it starts to boil. Turn down heat to low and let simmer 3-5 minutes, until sauce thickens. Serve over skirt steak.