Tenner Martini

Select and pre-chill a martini glass.

Prepare a garnish by twisting a strip of grapefruit zest.

Stir the gin, dry vermouth, and grapefruit bitters with ice in a mixing glass.

Fine strain the mixture into the chilled martini glass.

Express the grapefruit zest twist over the cocktail to release its oils, then use it as a garnish.