If you’re looking for grilling ideas, you came to the right place—you only need a few simple ingredients to make this delicious Guinness marinade for grilled steak. It’s the perfect summer recipe for the next time you fire up the barbecue… DIRECTIONS: Combine 1 bottle of Guinness Extra Stout, ¼ cup of dark brown sugar, ¼ cup of olive oil, 2 tbsp Worcestershire sauce, 2 tbsp Dijon mustard, 3 cloves of garlic, 1 tsp black pepper & salt in a plastic bag with flank steak. Allow to marinate.