The original "the potato eaters" is by Vincent Van Gogh, the parody comes from a shop that sells fried potatoes... But the master coup was finding the postcard that illustrates the same scene... After such investigative work, I guess I deserve some fries... But to quote that dialogue from Pulp Fiction:
Jules: What do they call a Whopper?
Vincent: I dunno, I didn't go into a Burger King. But you know what they put on french fries in Holland instead of ketchup?
Vincent: I seen 'em do it. And I don't mean a little bit on the side of the plate, they fuckin' drown 'em in it.
For your info, mayonaise costs 35 cents extra.