Makes about 20. To assemble the blini platter, place the tomato wedges in a strip down the middle of a large plate or platter and arrange the smoked fish on either side. Sprinkle a row of chopped red onion on one side and a row of chopped green onion on the other. Then fold blini in half or roll up and arrange rows on either side of the platter. Fill in edges with caper berries and parsley or cilantro.
Guests can choose ingredients to roll inside the blini.