If you’ve found yourself using a lot of egg yolk in baking recently, you’ll need a good recipe for egg whites. Meringues, mousse, toppings and cocktails are some of the most popular recommendations. But if those sound too complicated, then one of your easiest options might be macaroons. This nutty variety, popular in Germany, can be made with a coconut or hazelnut. The key to making them light and fluffy is beaten egg whites. Thanks to their composition of water and certain proteins, it can trap air bubbles quite stably, says Julia Icking from Germany’s Centre for Nutrition (BZfE). Here is her…