Slow-cooked Duck Egg Yolk with Creamed Spinach and Dukkah

When cooked sous vide, rich and delicious duck egg yolks will set to a soft custard-like consistency that cannot be achieved via other methods, making it easy to separate the white (although it is still worth doing an extra egg, just in case one breaks). I serve this as a starter at dinner parties on cold nights, when the warm spices and lushness of the yolk really help settle the guests. Making the Turkish bread biscuits and blanching the spinach can be done well in advance, the dukkah kee