Chill the Glass: Place a cocktail glass in the freezer for a few minutes or fill it with ice water to chill.
Mix Ingredients: In a mixing glass, combine the rye whiskey or bourbon, sweet vermouth, and Angostura bitters.
Stir with Ice: Add ice to the mixing glass and stir for about 20-30 seconds until well chilled.
Strain: Strain the mixture into the chilled cocktail glass.
Garnish: Garnish with a maraschino cherry.