Shake with ice:
2½ ounces Maker’s Mark Bourboun
½ ounce Sweet Vermouth
½ ounce Dry Vermouth(without this it’d just be a Manhattan)
2 dashes of bitters

Strain the mixture into a chilled martini glass.

Garnish with a Maraschino cherry (add a second one and a tiny bit of the syrup to taste)