What unique ingredient is typically included in a Nutty Irishman?

The Nutty Irishman is a cocktail that is well-known for its distinct flavor profile, which primarily comes from the inclusion of Frangelico. This hazelnut liqueur is essential to the drink as it provides the nutty taste that characterizes it. The combination of Frangelico with Irish cream, usually Bailey's, creates a rich and creamy texture that balances the sweetness of the liqueur with the smoothness of the cream.

While Amaretto, Bailey's Irish Cream, and Grand Marnier are delicious liqueurs that can be enjoyed in other cocktails, they do not have the specific nutty element that Frangelico uniquely contributes to the Nutty Irishman. Thus, Frangelico is the key ingredient that differentiates this cocktail from others, making it a classic choice for those looking for a rich, hazelnut-infused drink.