Fruitcake! Looks worth a try! My parents used to get fruitcake from Saint Mary’s of the Lake every year and sell it in their restaurant. They never made a profit - it was too good to all make it to the sales counter! :-) But that organization stopped making it. I found their recipe and made it once, but haven’t had the time to do so since.
If your parents wanted large quantities of Gethsemani fruitcake, they might negotiate a bulk discount.