These are a mainstay of almost every pastry shop in Switzerland. These are a sweet cookie, as anything meringue-based tends to be. In the past I always used unsweetened chocolate to make them, but I once accidentally substituted some premium bittersweet chocolate and the cookies were already in the oven before I realized my mistake. Though still sweet (the sugar in the chocolate didn’t really make them appreciably sweeter), they had a much more complex flavor because of the superior quality of the chocolate. An S shape is traditional for these, but of course you may pipe them in any shape you wish.