Capelin is a small sea fish that live in the cold northern oceans. Capelin roe is considered as a high value product and prepared by steeping in brine and then packing in small glass jars. As this product is very popular in Japan too, you might have tried this product in various kinds of sushi.
Capelin roe is often spread over buttered French bread in Russia, to be had with a cup of tea for a snack. As finger food, you may cut miniature cubes or other figurrettes from bread, butter and spread the caviar. It is an delicate taste and texture.
Other Russian snack products.