'Shroom Burger

What is it?

Breaded portobello cap sits at the center here, stuffed with muenster and cheddar, then fried until the crust turns crisp and the cheese melts through the middle. It comes on Shake Shack's Martin's potato roll with lettuce, tomato, and ShackSauce, so you get a soft bun, a juicy mushroom, and a molten center in one bite. Unlike the chain's beef burgers, this vegetarian sandwich leans on the mushroom's earthy texture instead of a patty. It's also used in the Shack Stack, where it gets paired with beef inside the same bun.