Preheat the oven to 220 ° C top / bottom heat.

Roll out the defrosted puff pastry into a rectangle of approx. 30 x 40 cm.

Finely chop the onion, wash, clean and finely dice the peppers and sauté both in 2 tablespoons of oil for 10 minutes.

Mix the minced meat with the egg, salt, pepper and tomato ketchup.

Drain the steamed vegetables. Then mix the vegetables into the minced meat and spread the meat dough evenly on the puff pastry.

7. Dice the piece of Emmental very finely and then sprinkle it on the meat dough and roll up the puff pastry.

8. Brush the strudel with egg yolk and press the edges together firmly.

9. Place on a baking sheet lined with baking paper and slide into the preheated oven.

10. Bake the strudel for 10 minutes at 220 degrees, then switch down to 175 degrees and bake for another 25 minutes.