This pistachio and coconut cake recipe is a tropical and nutty dessert that is perfect for summer. The cake is made with ground pistachios, coconut flour, and shredded coconut, giving it a nutty and coconutty flavor. The frosting is a simple whipped cream frosting that is flavored with coconut extract and tinted green, adding a tropical sweetness that complements the nuttiness of the pistachios. This cake is perfect for any outdoor gathering, from a pool party to a luau.