So, having made a bottle of Grapefrucello, I'm now trying to find a use for it. Handily, I was holding a cocktail training session at work this afternoon and co-opted some of the staff into giving me a hand. Here's what we came up with:

Niccolò Martini
40ml 42 Below Passionfruit Vodka
20ml Grapefrucello
15ml Martini Extra Dry Vermouth
1 dash Campari

Stir all ingredients with ice and fine-strain into a chilled martini glass. Garnish with an orange zest twist.

Papa Ain't Comin' Home

25ml Appleton's V/X Rum
25ml Grapefrucello
20ml Lemon Juice
2 dashes Angostura Orange Bitters
1 dash egg white

Shake all ingredients with ice and fine-strain into a chilled martini glass. Garnish with a lemon zest twist.

Copperbottom Fizz

25ml Tanqueray Gin
20ml Grapefrucello
10ml Pimm's No. 1
20ml Lemon Juice
10ml Cranberry Juice

Build with cubed ice in a highball glass. Garnish with a lemon wedge.