Clean and chop the leek and mushrooms. Fry both with a little oil in a pan and deglaze with a dash of white wine and smear a little again, season with the spices, then remove from the stove and let cool down.
Roll out the puff pastry.
Mix the minced meat with the eggs. If the mixture is too runny / thin, just add some breadcrumbs. Add the leek and mushroom mixture, season again if necessary and distribute everything on the puff pastry. Then coat the mixture thinly with mustard and pour the cheese over it. Now shape everything into a roll and cut into 1.5-2cm thick slices (works best if you let the roll rest in the refrigerator for half an hour to an hour) and place on a baking sheet. Bake at about 160 degrees for 25 minutes.