Let the puff pastry rest for about 10 minutes at room temperature. Cut the bacon slices into three lengthways. Whisk egg yolk and 1 tbsp. water. Unroll dough together with baking paper and cut crosswise into 24 strips. Place a strip of bacon on each strip of dough and turn into a spiral.
Place the spirals on two baking trays lined with baking paper. Brush with egg yolk. Bake one after the other in a preheated oven (electric oven: 225 °C/circulating air: 200 °C/gas: level 4) for about 10 minutes.
Peel and finely dice the onions. Clean and wash the leek and cut into fine rings. Form small balls from the ground pork with moistened hands.
Heat the oil in a large pot. Brown the meatballs all around. Remove. Sauté onions and leek in hot frying fat for about 5 minutes, turning. Dust with flour and sauté briefly.
Deglaze with wine, 1 l water and cream. Stir in broth and cheese. Bring to the boil.
and simmer at medium heat for about 10 minutes.
After about 5 minutes add the meatballs. Season soup with salt, pepper and nutmeg. Serve and add the puff pastry sticks with bacon. Drink tip: dry white wine, e.g. a Pinot Blanc.