Several months ago I watched Dorie Greenspan make madeleines on the Martha Stewart Show. While the madeleines looked divine, what struck me most from her demonstration was her handling of the lemon zest. Rather than whisk the zest directly into the dry ingredients, she placed it in a small bowl with the sugar and massaged the two ingredients together with her fingertips until she had created a moist and fragrant citrus sugar, a technique, she says, that serves to release oils from the zest into the sugar, making the lemon flavor twice as pronounced.