Emerson

Fill a mixing glass with ice cubes, adding enough to chill the glass thoroughly.

Pour the gin, sweet vermouth, and Maraschino liqueur into the mixing glass with ice.

Add the juice from half a lime to the mixing glass.

Stir the mixture vigorously for about 10 seconds until well-chilled and diluted.

Strain the cocktail into a coupe glass or martini glass, leaving the ice behind.

Serve immediately at room temperature.