Serve at room temperature, or cover and refrigerate for up to 4 days. Return to room temperature before serving.
Melt one tablespoon of butter in a small non-stick skillet over medium-high heat. When the butter foam begins to subside, add one-fourth of the batter and fry the blini until golden, about 2 minutes. Turn and cook for an additional 2 minutes. Transfer the blini to a plate with a spatula and keep warm in a 150°F oven while making the remaining blini.