Paper-thin slices of raw mutton you cook yourself for a few seconds in plain boiling broth in a copper pot, then dip in sesame paste sauce. A Beijing hot pot; the broth is not spicy.
Old Beijing-style mutton hot pot is most authentic with a copper pot.
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Beijing's signature hot pot - paper-thin mutton dipped briefly into a clear broth in a copper pot with a chimney, eaten with sesame-paste dipping sauce (麻酱). Different beast from Sichuan 火锅 (huǒguō), which is spicy and ingredient-loaded.