Peel and finely chop the onion. Fry in vegetable oil until golden brown.
Cut each sausage lengthwise into 2 parts.
Separate the egg whites from the yolks. Whisk the whites into a thick foam.
Pour out each bag of boiled rice separately, let it cool. In one part, add the beaten egg yolks with ground pepper, in the second – the beaten egg whites. Mix gently.
Grease the baking dish with oil, put rice with yolks, fried onions on top.
Lay out half of the sausage products cut down.
Put the rice egg whites on the sausages.
Brush with sour cream.
Bake for 30 minutes at a temperature of 170-180 degrees. 5 minutes before cooking, I turned on the grill mode for a more ruddy crust.