Clean and wash the leek and cook in boiling salted water for 5-8 minutes. Bring 1/2 litre of water and 1 teaspoon of salt to the boil. Add milk and stir in the puree flakes. Let it swell for about 1 minute and stir again. Flavour with nutmeg.
Drain the leek sticks and wrap each with 1 slice of cheese and 2 slices of bacon. Fill the mashed potatoes into a piping bag with star-shaped spout and squirt into an ovenproof dish. Place leek sticks on top and bake in a preheated oven (electric: 200 °C/ gas: level 3) for 15-20 minutes. Wash parsley, dab dry and chop. Serve leek sticks sprinkled with parsley and pepper