Did you know you can cure an egg yolk? It's a way of preparing the yolk by preserving it in a salt and sugar mixture and then drying it until it's hard. You can take the yolk and crumble it over vegetables, pasta, or rice. You can use it in soup to give a depth to dishes. It gives a savory flavor, similar to Parmesan Cheese.
Here's the recipe for Curing Yolks from Bon Appetit