Lemon Custard

My daughter developed a tendency to break out in a red clown face when she eat citrus fruit so we had a lot of lemons to kill one night. We ended up making this lemon custard recipe: http://allrecipes.com/recipe/lemon-custard-filling/. We substituted the sugar with maple syrup and the cornstarch with tapioca starch and it turned out perfectly. Just don't cook too long or it gets gummy. Soon we will pair this with a meringue top to use up the egg whites since the recipe takes only the yolks (I love the ingenuity of traditional recipes!). This is a recipe we have not tried that gives instructions for each part: http://www.fitfreshfearless.com/lemon-meringue-pie-with-coconut-crust/.