Grapefruits
For this cake you need Grapefruits (of course) in any variety. The most commonly know grapefruit is the pink grapefruit. But any variety can work. We used the white variety in our pictures and one of the test batches with just as flavorful results. So no matter which variety you find, it can be used in this recipe.
Yogurt
We used plain whole milk yogurt in this recipe. We have not tested it with dairy free yogurt but if you do, please comment and let us know!