An icy Rye Manhattan with spicy whiskey, sweet red vermouth, and Angostura bitters for a polished cocktail-hour pour.

Add the rye whiskey, sweet red vermouth, Angostura bitters, simple syrup, and water to a large pitcher or mixing container.
Stir well until the syrup is fully blended and the color looks even throughout.
Pour the mixture into your slush machine and run until it reaches a smooth, icy, pourable consistency.
Dispense into chilled glasses and serve right away for the best texture.
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