The cookies were actually supposed to be just lemon, but we love this duo and we knew his coworkers would be game since those lemon-lime bars we made back in March were a hit. To force those two into the cookies, we beat both lemon and lime zest into the butter and sugar mixture before we got too far in. When we tossed the egg in, we also brought the juices from the zested citrus fruits into the mix, along with a splash of vanilla. The vanilla isn't there to make them taste like vanilla, but the extract acts to round out the sweet notes with a subtle floral essence.
Being just a basic butter and sugar cookie, the lemon and lime play key roles to add a clean, zesty flavor that while good on their own, deserve a little support to up their intensity. Rather than a heavier frosting, these cookies get a thin glaze that is studded with more of that fierce zest. Made simply by combining powdery confectioners' sugar with the two zests and enough of both fresh lemon and lime juice to thin it out. You could dip the tops of the cookies in or take a spoon and let the glaze gently flow over the top - to keep clean, set the adorned cookies onto a wire rack with either a sheet pan or the like underneath to catch any drippings that come off. I did find that the glaze was fairly loose, so I scooped up it up and spooned it over the cookies for a second time to give them a good, shiny coat. You may want to hold back on the juice when mixing it together and just add enough to get a consistency you like.
The texture of the cookies crosses between being crispier around the outside edges, yet more soft and delicate as you reach their centers. While you don't get assaulted with a pungent, pucker-y punch, these cookies are just sweet enough and decidedly citrus in nature, which was like enjoying a warm spring sun shining down on my face as I let each bite slowly melt in my mouth. If lemon or lime (you could use just one or the other too!) doesn't conjure a thrill, how about switching the citrus zest and juice to orange and go in a different colorful direction?
Glazed Lemon-Lime Cookies