In a cocktail mixing glass over ice, add gin, vodka, fresh-squeezed ruby red grapefruit juice, orange curacao, and grapefruit bitters.

Using a long-handled bar spoon and stir vigorously for 30 seconds.

Strain into a serving glass of ice.

Garnish with a wedge of grapefruit and a fresh sprig of oregano, thyme, mint, or marjoram.

Serve.