What is the primary spirit used in an Avanti House Manhattan?

The primary spirit used in an Avanti House Manhattan is Old Forester Rye. The Manhattan is a classic cocktail, traditionally made with rye whiskey, which provides a spicier and more complex flavor compared to bourbon. Rye whiskey's characteristics, including its dry and slightly fruity notes, contribute to the balance of the Manhattan when mixed with sweet vermouth and bitters. Old Forester Rye specifically adds depth and a robust quality that complements the ingredients effectively, enhancing the overall taste of the cocktail.

In contrast, other spirits listed, such as gin, Cointreau (an orange liqueur), and bourbon, are not typically associated with a classic Manhattan. Although bourbon can be used in place of rye in a Manhattan, the traditional recipe and the context of the question indicate that rye is the preferred choice at Avanti House.