In a bowl, whisk together the rye flour, all-purpose flour, and salt.
Add the eggs, then gradually whisk in the milk and sparkling water until you have a smooth batter.
Let the batter rest for 15 minutes to allow the ingredients to properly combine.
Heat a skillet over medium heat and grease it with a little butter.
Pour a ladleful of batter into the skillet, spreading it evenly to create a thin pancake.
Cook for 1-2 minutes, until the bottom is golden brown, then flip with a spatula and cook for another minute.
Repeat the process with the remaining batter until all the pancakes are cooked.
Spread the cooked pancakes with sour cream, then top with smoked salmon.
Thinly slice the radishes and red onion, then sprinkle over the pancake.
Garnish with fresh dill and serve with a wedge of lemon.
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