For the frittata soup, mix flour, egg, milk and salt with a mixer until smooth. Leave to swell for 15 minutes and cut the chives into rolls.
Melt fat in small portions in a frying pan and bake 4 to 5 narrow pancakes in order. Let cool on a roasting rack.
Roll up pancakes and cut into thin strips. Place 1/4 of each pancake in a soup cup and spread the hot clear soup evenly over it.
Serve the pancake soup sprinkled with chive rolls and enjoy.