Daly's Bartenders' Encyclopedia by Tim Daly (1903, p.89)

1lemon peel — Twist a piece on top.acid
1 lumpsugar base
Whiskey — Fill the glass with whiskey.base
0.5 glasshot water — Half fill the glass and dissolve the sugar.dilution
  1. Dissolve the sugar in hot water in a hot whiskey glass.
  2. Fill the glass with whiskey, twist a piece of lemon on top, and serve.

Garnish: Twisted lemon peel.

This is a useful hot skin checkpoint beside Daly's hot punch and sling branches.

The twisted lemon peel is what moves this from a plain hot whiskey toward skin service.

The Old Waldorf-Astoria Bar Book by Albert Stevens Crockett (1935, p.88)

1 piecelemon peel acid
1 lumpsugar base
1 jiggerWhiskey base
water — hot waterdilution
  1. Build and serve hot.

See also: Hot Scotch