Brussels waffles

Preparation

Take the fresh yeast and dissolve it in part of the lukewarm milk.
Put the flour in a mixing bowl and make a well in the middle, then add the yeast mixture, the rest of the lukewarm milk, and the sparkling water. Whisk this into a smooth mixture.
Add a pinch of salt and the egg yolks and whisk lightly. Then add the melted butter to the batter.
Beat the egg whites until stiff and gently fold them into the batter. Let the batter rise for about half an hour to one hour under a damp towel in a warm place.
Take your FRITEL waffle iron, with the 4x6 waffle plates for authentic Brussels waffles, set the thermostat to setting 6, and let the waffle iron heat up.
Pour the batter into a pouring jug. Fill the bottom plate completely with batter in one go. Always do this from back to front. Now close the waffle iron, turn it over (flip-over), and bake for 3 to 3.5 min. Turn the waffle iron back over and bake for another 3 min.