Which of the following is NOT a bean, nut, or seed liqueur?

Limoncello is characterized as a lemon liqueur, traditionally made from lemon zest, alcohol, water, and sugar, primarily focusing on the fresh citrus flavor of lemons rather than any bean, nut, or seed. The key components in its production contribute to a bright and zesty profile, setting it apart from the others listed in the question.

In contrast, Nocino, Tia Maria, and Frangelico all incorporate elements that are derived from beans, nuts, or seeds. Nocino is made from green walnuts; Tia Maria contains coffee beans and sugar, often incorporating vanilla; and Frangelico is a hazelnut liqueur that also includes cocoa and vanilla, highlighting its nut base. This clear distinction reinforces Limoncello's unique category apart from the others.