In this video, we learn how cook marinated flank steak in peppercorn sauce. To make the marinade, juice 1/2 of a lemon and add 2 cloves of garlic, 2 tbsp of peppercorn, 1/4 c vegetable oil, 1/4 c aged balsamic vinegar, 1 tbsp worcestershire sauce and 2 tbsp barbecue sauce. Blend all of these together until it makes a nice sauce consistency. Now, pour your marinade into a plastic bag and place your flank steak inside. Let soak for at least one hour (the longer you let it marinade for, the more flavorful it will be) and when finished, cook as you desire!