Daly's Bartenders' Encyclopedia by Tim Daly (1903, p.87)

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

Garnish: Twisted lemon peel.

This is a useful hot skin checkpoint that sits between sling and punch service styles.

The twisted lemon peel is what distinguishes the skin from the plainer sling.

See also: Hot Scotch Whiskey Sling, Hot Scotch Whiskey Punch