This recipe is based on the famous Key lime pie from Joe's Stone Crab restaurant in Miami Beach. If you can't find Key limes, use regular fresh lime juice. The bars will keep, wrapped in plastic, in the refrigerator for up to three days.
Food editors prepared this recipe as part of the "Cookie of the Week" series on Martha Stewart Living Radio.
Though fried green tomatoes are commonly thought of as a Southern staple, they were actually an invention of 19th-century Northern farmers who would pick the remaining green tomatoes from their vines before first frost.