Cloves are the dried small buds of a tropical tree.

The following recipes on this site use cloves:

Hot Buttered Rum (batter mix)
brown sugar, butter, salt, nutmeg, cloves, cinnamon,
Tom and Jerry (batter mix)
eggs, rum, cinnamon, cloves, allspice, cream of tartar, sugar,
Cafe Diable
orange, brandy, cloves, sugar, coffee,