
Chop green cabbage and Les Cultures de chez nous leek white. Blanch in salted water. Drain.
Chop smoked bacon and roast with chopped pork in warm margarine. Mix with vegetables and adjust seasonings with Worcestershire sauce. Place the mixture inside the cannelloni and on an oven-safe plate. Soak with white wine and water until the cannellonis are entirely covered. Oven-bake under aluminum sheets for 30 minutes at 375°F (190°C).
For the sauce, prepare warm béchamel sauce. Season with pepper, salt and nutmeg. Add Parmesan and melt. Whisk the tomato concentrate and ketchup. Set the cannellonis and coat them with sauce. Spray finely chopped parsley.

To keep leeks in the freezer for a long time, they must be clean, dry, cut and in an airtight bag or container.
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