Add gin, dry vermouth, and (if using) orange bitters to a cocktail shaker filled with ice. Alternately, you can place the ingredients in a mixing glass.
If using the cocktail shaker, shake until chilled. If using the mixing glass, stir until well mixed and chilled.
Remove chilled glass from freezer. Strain the 50/50 mixture into the glass.
Garnish with a lemon twist, olive skewer, or garnish of choice. Sip and enjoy!
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