Cucumber is needed but it is salty. Grate the cucumber and lightly squeeze out the juice.
Cheese or grate or finely chop.
Cut the onion finely.
Mix vegetables and cheese with proteins, pepper to taste.
Salt is not necessary because there is enough salt from cheese and cucumber.
Melt the butter and pour out the mixture. Lightly cauterize.
Then carefully spread the yolks, and fry until tender.