This lovely cake was inspired by the colors and flavors of pink lemonade. Don’t be tempted to skip the first step of this recipe, which asks you to rub lemon zest into granulated sugar: The sugar granules help release the essential oils in the zest, making for a brighter lemon flavor and fragrance. (If you’re really short on time, you can skip using your hands and just mix with the paddle attachment inside the mixer bowl on low speed for 1 minute.) Slather this sunny cake with swoopy, easy-to-make raspberry whipped cream then serve as is, or dressed up with lemon zest or sprinkles.