Turn on the oven at 180 degrees, so warming up, not wasting time. Until thawed dough in salted water boil the fish until tender (I usually stay tails, which cook very quickly). Peel, cut half rings and fry the onion in a small amount of a mixture of vegetable oil and butter. (Please forgive the first two pictures did not work)

On a baking sheet, lightly greased with vegetable oil, vykladyvaem single layer of dough (puff pastry I rolled out and stretched by hand, I think that works better). The fish, freed from bones, vykladyvaem layer. On top put fried onion

Eggs, chop coarsely and spread over onions

Close second half of the dough and brush with beaten egg.

And put into the oven to reach readiness. I have it usually takes 20 minutes, as all ingredients are ready. Bon appetit! And the guests are fed, and I'm happy!!