Flank Steak Tostadas
Quick-pickled onions and a simple yogurt-lime cream sauce lend complex flavors to these crispy steak tostadas.
Tips: To oil a grill rack, oil a folded paper towel, hold it with tongs, and rub it over the rack. (Do not use cooking spray on a hot grill.)
You can use the reserved vinegar from the pickled onions to make salad dressing or in any other recipe that calls for red wine vinegar.