Pizza
The pizza demonstrates what evolutionary biologists might term extraordinary phenotypic plasticity. The basic template, dough, sauce, toppings, has proven infinitely malleable whilst retaining core identity. Regional variations have proliferated with remarkable creativity: the deep-dish of Chicago, the thin crust of New York, Japan's mayonnaise and squid interpretations, Sweden's controversial banana curry experiments. The pizza has successfully colonised breakfast menus, spawned dessert variants, and adapted to every dietary restriction from veganism to keto. This adaptability extends to economic conditions; pizza functions equally well as street food or gourmet experience, scaling from one-dollar slices to 12,000-dollar truffle-topped extravagances.