Peel garlic and dice finely. Clean the leek, wash thoroughly and cut into thin rings. Heat the oil in a pan. Stir-fry the garlic and leek for 3-4 minutes, do not fry.
Whisk the sour cream and eggs. Season with salt, pepper and nutmeg. Preheat oven (electric cooker: 175°C/circulating air: 150°C/gas: level 2). Place a quiche or springform pan (26 cm Ø) with baking paper
Roll out the dough and cut it in half crosswise. Lay the dough sheets overlapping in the form and press up at the edges.
Sprinkle the dough base with breadcrumbs. Mix leek and salmon on top. Pour egg icing over it. Bake in the oven on the lowest shelf for 50-60 minutes. After 30-40 minutes cover with aluminium foil.
Cut the quiche into pieces and serve.