Do you find yourself flummoxed every time you come across a recipe that calls for a piping bag? Stranded with an empty piping bag in one hand and a half-dozen piping tips scattered around the counter, and don’t know where to start? Do you wish you could pipe delicate ruffles or intricate details on your birthday cake and pastries, or pipe a batch of luscious pastry cream inside an eclair? It’s time to befriend your trusty piping bag.