lagniappe
noun
la·gniappe
| \ ˈlan-ˌyap
, lan-ˈyap\
, lan-ˈyap\
Definition of lagniappe
: a small gift given to a customer by a merchant at the time of a purchase
broadly
: something given or obtained gratuitously or by way of good measure
The waiter added a cup of lobster bisque as a lagniappe to the meal.