Mix eggs and sour cream in a bowl.
Place flour, salt and butter in a food processor. Pulse for a few times to get butter into pea size crimbles.
Add egg mixture and pulse for a few more time until dough starts to come together.
Dump the mixture on the slightly floured counted and press it together to a ball. Cover with a plastic wrap and place it in the refrigerator for 30 min.
In a meantime mix meat, onion, salt and pepper together.
Divide dough into 18-20 equal pieces.
Roll each piece into 2-3 mm. thickness ball.
Place generous amount of meat in a middle, close ends braiding them and place kibinai on a cooking sheet lined with parchment paper.
Brush each top of kibinai with an egg mixture.
Cook in a preheated to 395 F oven for 25-30 min, or until it's golden brown.
