The classic americano, first served at Bar Caffè Campari in Milan in the 1860s, is equal measures of Campari and sweet vermouth over ice and topped with soda. This is true to the spirit of the original, and makes a virtue of Campari’s affinity with grapefruit. It’s my go-to summer refresher. Serves one.

25ml Campari
25ml Martini Rosso
25ml pink grapefruit juice (ideally fresh)
San Pellegrino pompelmo (grapefruit soda), to top
1 small slice pink grapefruit, to garnish

Pour the first three ingredients into a tall glass over cubed ice, stir gently, top with soda and garnish.

• Marcis Dzelzainis, Sager + Wilde, Paradise Row, London E2.