Scotch Highball

Harry of Ciro's ABC of Mixing Cocktails by Harry of Ciro's (1923, p.81) — Harry of Ciro's 1923

1. Put 1 lump of ice in a large tumbler and squeeze in a piece of lemon peel.
2. Hand whisky to customer to serve himself and fill with soda.

Garnish: Expressed lemon peel

Ice: 1 lump ice

This matters because it preserves customer-finished Scotch highball service explicitly rather than flattening it into a generic mixed drink.

Customer-finished service is the key historical detail here.

Barflies and Cocktails by Harry McElhone and Wynn (1927, p.71) — Customer-finished service

1. Put the ice and squeezed lemon peel into a large tumbler.
2. Hand the whisky to the customer to serve himself and fill with soda.

Garnish: Lemon peel

Ice: 1 lump ice

This matters because it preserves highball service as a ritual of customer choice, not just a fixed mixed specification.

The source makes the customer-finished handling explicit, which is part of the drink's service identity.