Fancy Drinks and Popular Beverages by William Schmidt (1896, p.29) — Fancy Drinks and Popular Beverages 1896, No. 36

1 drinkhot Scotch — Source says same as hot Scotch.base
  1. Pour hot Scotch into a hot silver mug, light it, leave it burning about two minutes while pouring it into another hot mug and back again, then serve.