This cookie tastes like a narcissistic chorus line of citrus, salt and sugar vying for the lime (insert soft eye-roll) light. Let them duke it out and enjoy the full-tilt sherbetty tongue tingle. I like just a whisper of the frosting so the sandwich is more cookie than cream, but there’s some extra frosting if you prefer the converse ratio. This is a great recipe to use up those limes that have ripened to yellow — their humble acidity brings a touch of class to the show. The dough is counterintuitive to mainstream cookie techniques, but it gives these a buttery brittle snap; it’s a cinch to roll while cold and they hold great shape when baked.