Very finely chop leftover roast.

Peel and finely chop an onion.

In a frying pan, heat the cooking oil then brown the minced meat with the onion for about ten minutes. Salt and pepper. It must be well grilled. To book.

In a small saucepan, melt the butter over medium heat.

Remove from the heat and add the flour all at once, stirring quickly until you get a ball of dough.

Return to the heat for 2 seconds to dry the dough a little then gradually pour in the milk, mixing quickly with a hand whisk (to avoid lumps) until the béchamel thickens. Salt and pepper.

Preheat the oven to 200 ° C.

Mix the béchamel with the meat.

Spread puff pastry in a pie dish and prick it with a fork.

Pour in the preparation with the meat.

Cover with the other puff pastry, seal the edges well.

Mix an egg yolk with 1 tablespoon of water.

Brown the top of your pie.

Decorate with the tip of a knife, taking care not to cross the dough.

Bake for 25 minutes.