Fry the bacon in a frying pan until crispy, add the leek and stir-fry for about 3 minutes.
Mix flour, salt and pepper in a bowl, add milk and stir until smooth. Stir in the egg yolk and bacon and leek mixture.
Beat the egg white with the 2 pinches of salt until stiff, fold carefully into the batter.
Heat a little olive oil in a pan. Add half of the batter. Reduce the heat, bake the dough until the underside loosens, turn and bake for about 4 minutes. Pluck into small pieces with two roasting paddles and keep warm. Do the same with the second part of the dough.
Tip:
Add some fresh herbs to the bacon and leek mixture, e.g. basil, chives, parsley.