Came up with this original recipe, and it turned out perfect. So I want to share it.
Baking with fresh citrus requires maximizing the aromatic oils locked inside the peel without hitting the bitter white pith beneath. Whole oranges provide both the zest and liquid for this crumb structure, which relies on mechanical leavening from whipped egg whites rather than chemical agents alone. Budget bakers will appreciate how three standard grocery-store oranges flavor a batter built on basic flour, sugar, dairy, and eggs.
Allow the baked cake to cool completely on a wire rack before slicing to let the crumb set properly. Store leftovers tightly wrapped at room temperature to maintain moisture for up to three days.