Cook lentil stew with bacon according to instructions on the bag. Clean the leek, rinse, cut into slices, grate the cheese coarsely. Grease a gratin dish. Pour in leek slices. Pour lentil soup on top. Sprinkle with cheese and bake in the oven at medium heat (225 degrees ) for 25 minutes.
Our tip: Use a deliciously spicy bacon for a delicious touch!