I haven't made one, but I would think that you could use ground hibiscus flowers (or a dried powder) in a favorite yellow or white cake. Or, steep hibiscus tea in the liquid in a recipe (milk, water, etc). Hibiscus is good with lemon, so that might be an option as well.
I have not tried it in cake either, but I love hibiscus tea and it is good with lemon.
Sorry that I am late with responding. I wanted to say thanks for all the input, I tired a couple of different recipes and came up with a version of my own. I made my standard white cake, put lemon instant pudding in the mix, with a little lemon zest and added a couple of tablespoons of hibiscus powder with a splash of buttermilk, and poof I had cake that tasted pretty good. I was surprised about the texture and flavor. It is not super overpowering. Most of all the bride liked the taste. Thank you again for your assistance.
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