El Bar Americano en España by Pedro Chicote (1927, p.131)

ice — 3 pedacitos de hielo picadobase
whisky — Used to fill the rest of the glass.base
nuez moscada rallada — Added after stirring.other
1 coffee spoonazúcar en polvo — 1 cucharada de las de café de azúcar en polvosweetener
  1. Build in a wine glass with crushed ice and powdered sugar.
  2. Fill the rest of the glass with whisky, stir until the sugar dissolves, then finish with a little grated nutmeg and serve with straws.

Garnish: Nutmeg and straws

Ice: Crushed ice