01 - In a mixing bowl, whisk together buckwheat flour, all-purpose flour, baking powder, salt, and sugar until evenly blended.
02 - In a separate bowl, beat the egg with whole milk and melted butter until smooth.
03 - Gradually pour the wet mixture into the dry ingredients, whisking until a smooth batter forms. Let it rest for 10 minutes to hydrate.
04 - Heat a nonstick skillet or griddle over medium heat and lightly brush with butter. Drop heaping teaspoons of batter to form small pancakes approximately 1.5 inches wide. Cook 1 to 2 minutes until bubbles appear on the surface, then flip and cook another minute until golden. Repeat with remaining batter and allow to cool slightly.
05 - In a small bowl, combine softened cream cheese with lemon juice and chopped dill, stirring until smooth and well incorporated.
06 - Spread about 1 teaspoon of the cream cheese mixture onto each blini, then gently top with a folded slice of smoked salmon.
07 - Finish by garnishing with additional dill, freshly ground black pepper, lemon zest, and capers as desired. Serve immediately for best flavor and texture.