In a large bowl, whisk together the flour and salt, then add the eggs.
Gradually pour in the milk and sparkling water while continuously whisking to create a smooth, lump-free batter.
Let the batter rest for 15-20 minutes to allow the ingredients to fully incorporate.
Lightly grease a skillet with oil and heat over medium heat.
Pour a ladleful of batter into the skillet, spreading it evenly. Cook for 2-3 minutes, until the edges begin to pull away from the pan, then flip and cook for another 1-2 minutes.
Repeat the process with the remaining batter, re-oiling the skillet as needed.
For the filling, finely chop the onion and garlic, then sauté in a pan with a little oil until translucent.
Add the diced smoked knuckle and sauté for another 5-6 minutes, until lightly browned.
Stir in the sour cream, season with salt and pepper, and cook for an additional 2-3 minutes to allow the flavors to meld.
Fill each crepe with the smoked knuckle mixture, then fold or roll them up.
Place the filled crepes in a baking dish, sprinkle with grated cheese, and bake at 350°F (180°C) for 10 minutes, until the cheese is melted and slightly browned.
Serve hot, garnished with freshly chopped parsley.
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