I found this recipe and thought it looked like an easy one to prepare so I made it last night. It's not only easy but it is really good and I assume that you can use any citrus that you would like. The recipe instructions were not complete (Myra was slipping a bit), so make sure to follow these extra instructions. The recipe calls for 2 egg yolks, you will also need the whites and beat them to stiff peaks. I wasn't sure what kind of dish to use so I used a square glass 8x8 baking dish and it worked fine for me. I also refrigerated the leftovers. If you are gluten sensitive, use an all purpose gluten free flour, I did and I also used skim milk and the recipe turned out fine.