It's traditionally made from whatever the garden had left that week — there's no fixed recipe, only a technique.
Beans, seasonal vegetables, and grains simmer for hours into a thick, hearty soup-stew, ladled from huge cauldrons at Istrian village fešte (festivals) and sold by the bowl to feed a crowd.
Why it's made this way: Maneštra started as farmhouse cooking that used up whatever the land provided, and its role as festival food comes from how easily a single cauldron can feed an entire village.