When I was a little girl, my dad and I used to make this very simple, yet delicious dish on Sundays.
It's pretty much called " Duszona cebulka".
There are different variations of it, but this was ours.
Ours consisted of first frying up some cut up bacon pieces.
Then you had about three onions( I always tried to get as many as possible. The pot would be so full that you couldn't even stir the onions, but had to wait for them to shrink), cut in half moon slices.
Then put the onions in the pot together with the bacon, and put the lid on the pot ( lid on top is very important, otherwise the onions may burn and get dry).
Once the onions are super soft, you add an egg or two and stir it up. Season to taste and have it on some fresh bread/roll.