Solleone

Prepare the grapefruit cordial in advance: warm 1 cup grapefruit juice and 1 cup lemon juice, add 1 cup sugar and stir until dissolved. Cool, add the zest of 1 or 2 grapefruit and chill overnight, then strain. Use the listed 25 cc portion.

Chill a Goblet Glass glass by filling it with ice water while you prepare the cocktail.

In a cocktail shaker, combine the gin, Campari, and grapefruit cordial.

Fill the shaker with ice and shake vigorously.

Empty the ice water from the Goblet Glass, then strain the mixture into the chilled glass.

Garnish with a twist of grapefruit peel to finish.

Serve the strained cocktail over fresh ice in the Goblet Glass.