Prepare the ingredients: thinly slice the cucumber and red onion, and finely chop the fresh dill.
In a bowl, combine the sour cream, lemon juice, horseradish, and a pinch of salt. Set aside to rest.
In a separate bowl, whisk together the flour, baking powder, and salt. In another bowl, whisk the eggs, then add the milk and melted butter.
Pour the wet ingredients into the dry ingredients and stir until just combined. Do not overmix.
Preheat your waffle iron according to the manufacturer's instructions. Pour a portion of the batter onto the hot waffle iron and cook for 3-5 minutes, or until golden brown.
Spread the horseradish sour cream onto the cooked waffles, then top with the gravlax (cured salmon).
Arrange the thinly sliced cucumber and red onion on top, and sprinkle with fresh dill.
Serve immediately, optionally with a squeeze of extra lemon juice and a pat of butter for added richness.
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