There is a very popular street food in the philippines called Balut which is my personal favourite way to eat a duck egg, although not for the feint hearted!
The eggs are fertilized and allow to grow for up to a few weeks before being boiled.
Just...don't look at it and it's f*cking delicious!
As for more western uses, hollandaise made with duck yolks is definitely the best version i have ever tasted.
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