The Shack Stack takes the Shackburger, then adds a second patty. In between these two burger patties, it slaps a cheese-stuffed, deep-fried portobello mushroom cap. Oh sweet mother of god, is it good. Because Shake Shack isn’t a big chain, there’s no nutritional info available for this thing, which is probably for the best. I can’t imagine it’s less than 1800 calories. But man, is it worth it.
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