This recipe makes a fluffy roll cake using only four ingredients, without flour, oil, milk, an oven, or a mold. Whip egg whites in a meringue maker, then mix in egg yolks and rice flour, and bake slowly in an egg pan. Once the moist, fluffy sponge cake has cooled slightly, pipe whipped cream onto it, carefully roll it up in parchment paper to shape, and chill in the refrigerator. It features a gentle sweetness and aroma of eggs, and is an easy-to-make treat perfect for a home café experience, even for beginners.