Campari meets tonic water — an aperitivo that's more bitter and complex than a Spritz, more effervescent than an Americano. The quinine in the tonic amplifies Campari's herbal bitterness beautifully. Two ingredients, maximum impact.

• Campari5 cl
• Tonic water15 cl

1. 1Fill a highball glass or large wine glass with plenty of ice.
2. 2Pour in the Campari.
3. 3Top slowly with cold tonic water to preserve the bubbles.
4. 4Stir very gently.
5. 5Garnish with an orange slice and a sprig of rosemary.