Phantom Tollbooth Subtraction Stew

Subtraction Stew is what Milo eats in The Phantom Tollbooth, in Digitopolis. The ingredients are Assorted Polygons (crackers in various shapes) and Minus Symbols (pretzel sticks), mix them apart and soak or dip them in frosting of some kind. Won't really make you hungrier. Will leave you wanting more, though!