Czech piškoty, spongey biscuits made from flour and meringue, are the perfect launch pad for summery desserts that require hardly any preparation, thought, or actual baking. A few tips: Some of these recipes call for a spring-form pan. The smaller your pan, the more impressive your layers will be! Also, if you can’t find caster sugar, pulse an equal amount of granulated sugar in a coffee grinder. And for those in search of gluten-free biscuits, health food stores carry a variety of alternatives to flour-based piškoty.