Cut the slices of bacon into three lengthwise thirds. Whisk egg yolk and 1 tbsp. water. Remove puff pastry from the fridge 5-10 minutes before use. Roll out on the work surface and cut into 24 strips. Place 1 strip of bacon on each strip of dough and twist into a spiral. Place spirals on 2 baking trays lined with baking paper, brush thinly with egg yolk. Bake one after the other in a preheated oven (electric range: 225 °C/ convection oven: 200 °C/ gas: level 4) for about 10 minutes. Remove from the oven
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 casserole dish, fry the meatballs in it while turning, remove. Add leek and onions to the frying fat and sauté over medium heat for about 10 minutes, turning over
Season with salt and pepper. Dust with flour, sweat and gradually add stock, cream and wine. Stir in cheese. Bring to the boil while stirring and simmer for about 10 minutes at medium heat. Add the meatballs 5 minutes before the end of the cooking time. Season soup with salt, pepper and sugar
Arrange soup in deep plates. Sprinkle with pepper to taste. Add puff pastry sticks