For the omelette, whisk the eggs with mayonnaise in a large bowl, add the grated cheese and stir well. Spread the egg mixture on a baking sheet lined with baking paper.
Bake in a preheated oven at 180 ° C top / bottom heat for about 20 minutes until golden. Let the omelette cool on the baking sheet.
For the filling in the meantime, add the finely chopped onions and the egg to the minced meat, season with salt, pepper and mix well. Distribute the minced meat mixture evenly on the cooled giant omelette and carefully roll it up into a roll using the baking paper underneath.
Bake the roll in the hot oven for another 30-40 minutes.
The secret of this egg and cheese roll is ingeniously simple - it must not be over-seasoned! With each additional experimental ingredient, the recipe loses its delicate mildness.