You're probably ok just eyeballing it. My duck eggs are about the same size as a large chicken egg, so I don't adjust at all. You can always test it out by cracking a chicken egg into one bowl and a duck egg into another. If it looks like about the same amount of egg, don't adjust. If it looks like about twice as much (which I think is about normal for a large duck's egg) then use one duck egg in place of 2 chicken eggs.
I bet your friend's husband is allergic to duck eggs. The same thing happens to me when I eat them fried. If they are cooked in a less "runny" style, I'm fine.
I bet your friend's husband is allergic to duck eggs. The same thing happens to me when I eat them fried. If they are cooked in a less "runny" style, I'm fine.
^great question, was wondering that too. And thank all y'all for the wisdom. I know a friend who cooked duck eggs for her husband one morning fried, he thought they were chicken eggs, and he was sick all day and a while after that. That kind of detered me from duck eggs for consumption.