Some people sneer at the thought of a hot potato salad.  To appease those people we call this a casserole. 2lb potatoes 1/4 C cider vinegar 1T sugar 1/2t salt 1/2C sour cream 1/4C Havarti cheese, cut into chunks 5 gherkins, chopped 1 T whole ground mustard Boil potatoes whole in water until fork tender. …