I don't want to eat these, and I refuse to buy food if I won't eat it, so forgive the photo taken straight off the street stall. These are foetus eggs, fertilized chicken or more often ducks eggs sold boiled and eaten for 'fertility'. Like shark fin soup another ridiculous food with a fictional claim, yet still today they are eaten. If you're offended, don't click the 'read more' link, because it shows and egg in a later stage.
If you want to try rotten boiled eggs (which I recommend - they are delicious), watch out for these eggs, they are usually sold side by side.
They're eaten with noodles, or in soups, or just like this as a side dish.