When there is more fruit than can be gathered in an apron, Slovakia makes Bublanina, a.k.a. Bubbly Cake. Just one secret makes this slightly sweet cake light and fluffy: whipped egg whites. Fruit, sliced, chunked, or left whole, is scattered across the foamy surface and, as the cake puffs up in the oven, it bubbles around the fruit. Some fruit sinks down. Some fruit does not. Once out of the oven, the whole thing is covered with a cloud of powdered sugar, until even the air around it tastes…
