One of the most popular vegetables of the summer is zucchini, turning up as cheesy casseroles, fried appetizers, and warm breads. Go one step further and make this chocolate cake, guaranteed to become your go-to recipe for birthday celebrations, potlucks, and simple weeknight desserts. This impressive yet easy-to-make cake got rave reviews in our Test Kitchen and quickly developed a cult following. It's packed with plenty of green stuff (two medium zucchini), but your family will be too distracted by the chocolate flavor and the nutty brown butter frosting to notice that they are eating vegetables. For optimal texture, shred the zucchini on the large holes of a box grater. A tasty frosting is the crowning touch on a cake, and this Brown Butter-Pistachio Frosting has just the right sweet-salty balance to partner with the deep chocolate cake. Browning butter is a French cooking technique that, when used, can take a recipe from good to fabulous.