In a large bowl, whisk together the flour and salt, then add the eggs.
Gradually whisk in the milk and sparkling water, mixing continuously until you have a smooth batter.
Let the batter rest for 15-20 minutes to allow the ingredients to combine properly.
Lightly grease a skillet with oil and heat over medium heat.
Pour a ladleful of batter into the skillet and spread it evenly. Cook for 2-3 minutes, or until the edges start to lift from the pan. Flip and cook for another 1-2 minutes.
Repeat the process with the remaining batter, greasing the skillet as needed.
To make the béchamel sauce, melt the butter in a saucepan over medium heat. Add the flour and cook, stirring constantly, until light golden brown.
Gradually whisk in the warm milk, stirring continuously to prevent lumps.
Season with nutmeg, salt, and pepper. Cook for 5 minutes, or until the sauce thickens.
Dice the ham into small cubes, then stir it into the béchamel sauce.
Fill each pancake with the ham and béchamel mixture, then fold or roll them up.
Place the filled pancakes in a baking dish, sprinkle with grated cheese, and bake at 350°F (180°C) for 10 minutes, or until the cheese is melted and lightly browned.
Serve hot, sprinkled with extra grated cheese.
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