Created by Derf on May 12, 2013
Step 1: Marinade:
Step 2: Whisk together Marinade ingredients in a small bowl, place in a zip top plastic bag; add flank steak. Seal the bag and massage the marinade all over the steak. Refrigerate for at least 3 hours, preferabley overnight.
Step 3: Horseradish sauce:
Step 4: In a small bowl, whisk together sour cream , mayonnaise, horseradish and mustard.
Step 5: Season with salt and pepper to taste.
Step 6: Cover with plastic wrap; refrigerate while preparing steak.
Step 7: In a small bowl mix roasted red peppers, garlic and basil leaves, set aside.
Step 8: Heat broiler, if using, with rack 6 inches from heat.
Step 9: Remove steak from marinade; shake off excess marinade and place on a roasting pan fitted with a rack, if broiling.
Step 10: BBQ or broil 6 minutes on each side for medium rare. Let rest 5 minutes before slicing 1/4 inch thick against the grain.
Step 11: Place watercress or cilantro in a bowl; toss with oil and the lemon juice. Season with salt and pepper.
Step 12: Toast bread slices; place 1/4 watercress mixture on bottom slice of toast; place 1/4 of steak slices over watercress; drizzle horseradish sauce over steak; place 1/4 of roasted red pepper mixture over sauce; top with second slice of toast. Repeat for 4 sandwiches.
Step 13: Enjoy!