11 Delicious Burgers You Can Only Order Off 'Secret Menus'

In-N-Out's Animal-Style Burger

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In-N-Out's 3×3 Burger

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Shake Shack's Quad Burger

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Shake Shack's Shack-Cago Burger

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McDonald's Big McChicken

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McDonald's Land, Air, and Sea Burger

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