Converting this Lemon Custard Cake into a treat is so easy! Just replace the all-purpose flour with a gluten-free all-purpose flour blend of your preference. Make sure it's clearly labeled as gluten-free and specifically made for baking. The rest of the recipe stays the same keeping that combination of lemon and creamy custard intact. Now even those who are sensitive to gluten can enjoy every mouthwatering bite of this citrus creation.