Key Lime Cake Recipe - If you love bright citrus desserts, this key lime cake is a must-try! This moist key lime cake is layered with tangy homemade key lime curd and topped with a light, silky ermine frosting that isn’t overly sweet. It’s the perfect balance of sweet and tart and makes a beautiful dessert for spring, summer, holidays, or special occasions. If you’re looking for a fresh twist on classic citrus cake recipes, this homemade key lime cake will quickly become a favorite.