Mad Cook
Master Chef
I had them once, on an hors d'oeuvre platter at a party, filled with Heinz canned vegetable salad (aka Russian Salad - cooked mixed veg (carrots, potatoes and peas, etc.,) in salad cream. Pretty vile but I saw a certain promise and developed a home-made recipe with "good" lemon mayonnaise and freshly cooked and cooled veg and it turned out very well. Can't remember the details but it wasn't hard to invent.