Texsun
Coin-sized grapefruit zest twist (sun-like)
SHAKE all ingredients with ice and fine strain into chilled glass.
[['4.5 cl', 'Straight rye whiskey (100 proof / 50% alc./vol.)'], ['3 cl', 'Martini Extra Dry vermouth'], ['3 cl', 'Grapefruit juice (pink)'], ['0.25 cl', 'Sugar syrup (65.0°brix, 2 sugar to 1 water rich syrup)']]
[['4.5 cl', 'rye whiskey'], ['3 cl', 'dry vermouth'], ['3 cl', 'grapefruit juice'], ['0.25 cl', 'sugar syrup']]