This strawberry rhubarb layer cake recipe is a show-stopping dessert that is perfect for special occasions. The cake is made by layering moist and fluffy vanilla cake with a creamy strawberry rhubarb filling, then topping it with a crumbly streusel topping. The secret to this recipe is to use a piping bag to create a beautiful and decorative frosting design. Serve this cake chilled for a refreshing and elegant dessert.