El Bar Americano en España by Pedro Chicote (1927, p.144)

1 tablespoonazúcar en polvo — 1 cucharada de azúcar en polvobase
1 liqueur-glasswhisky escocés — 1 copa de las de licor de whisky escocésbase
agua hirviendo — Added in a moderate amount.dilution
1 slicerodaja grande de limón — 1 rodaja grande de limóngarnish
  1. Build in a whisky glass with sugar, Scotch whisky, and a large lemon slice.
  2. Add a moderate amount of boiling water and serve with a coffee spoon.

Garnish: Lemon slice

Chicote marks this one as hot.