Expert Answer:

Lisa Featherby, Gourmet Traveller food editor, answers:
You can use duck eggs in any way you use a chicken egg. They do make the best sponges, but, if you’re after something different, I would recommend finding unusual recipes for chicken eggs and substituting the duck egg (you may need to cook it longer and adjust quantities in some cases as it’s larger than a chicken egg). Most commonly, they are salted and preserved (as in the thousand-year-old-eggs you find in Chinese grocers). Fuchsia Dunlop is a great reference for recipes like this and has a book out called Revolutionary Chinese which is great for these kinds of recipes. Otherwise, they are great steamed in the shell (less harsh than boiling) and served with a hot-and-sour Thai-style dressing. Smoking them would also give you an unusual flavour and texture. The other way you can cook them is to slow cook them in a very gentle water bath. Justin North provided us a with a great recipe not long ago for a smoked duck egg and the texture was very unusual – quite gelatinous.