Clean the leek, remove the tuft and cut each stick into 12-15 cm long pieces. Do not overcook these pieces in the broth with the dash of wine.
Meanwhile spread the cheese on a board and brush with the mustard. Remove the leeks from the broth, wrap first with a slice of cooked ham, then with the coated cheese and place in a buttered casserole dish.
Now either pour some broth with cream or sour cream or cook a sauce from part of the broth, some butter and flour and pour it around the rolls (not on top!)
Then bake the whole thing in the 200 ° C oven until the cheese turns brown or runs.
The dish can also be prepared vegetarian without boiled ham.