Circles and Seasons

Combine the gin, grapefruit juice, maple syrup, and Angostura bitters in a cocktail shaker.

Add ice cubes to the shaker and shake vigorously until well-chilled.

Strain the mixture into a chilled martini glass.

Garnish with a twist of grapefruit peel, expressing the oils over the surface of the cocktail before placing it in the glass.