In a large bowl, whisk together the flour and salt, then add the eggs.
Gradually pour in the milk and sparkling water, whisking continuously until you have a smooth, lump-free batter.
Let the batter rest for 15-20 minutes to allow the ingredients to combine well.
Grease a skillet with a little oil and heat over medium heat.
Pour a ladleful of batter into the skillet and spread it evenly. Cook for 2-3 minutes, until the edges start to pull away from the skillet, then flip and cook for another 1-2 minutes.
Repeat the process with the remaining batter, re-oiling the skillet occasionally.
For the tomato sauce, combine the tomato sauce, oregano, finely chopped basil, and ground black pepper.
Spread the prepared tomato sauce on the cooked pancakes, then top with sliced ham and mushrooms.
Sprinkle grated mozzarella cheese over the top, then fold or roll up the pancakes.
Place the filled pancakes in a baking dish and bake at 350°F (180°C) for 10 minutes, until the cheese is melted and slightly browned.
Serve hot, garnished with freshly chopped basil.
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