To make this Lemon Velvet Cake gluten-free. Simply swap out the cake flour. For a reliable gluten-free flour blend. Such as Bob’s Red Mill Gluten-Free Baking Flour. Keep in mind. That gluten-free flours. Can sometimes alter the texture slightly. So adding ½ teaspoon of xanthan gum. To the dry ingredients. Can help maintain. That velvety softness. Everything else in this recipe. Is naturally gluten-free. Including the lemon curd. And buttercream. Making this a perfect option. For gluten-sensitive friends. And family!