The New York Sour Slush is a frothy, frozen version of a tart whiskey sour. Refined with a splash of sweet red wine syrup, this sophisticated adult slushy is easy to make and will be a hit at your next summer gathering.
In a small saucepan, combine wine and maple syrup and bring to a boil over high heat. Cook until it reduces in volume by half, about 10-15 minutes. Chill in the refrigerator until ready to serve.
Whiskey Base
In the container of a blender, combine the rye whiskey, maple syrup, lemon juice, zest and ice. Cover and blend until slushy, 15 to 30 seconds.
To Assemble
Spoon 1 to 2 tablespoons of wine syrup in the bottom of each glass. Top with the whiskey slush and serve.