
der Leckerbissen
delicacy
A particularly tasty and desirable food; a delicacy.
Die frischen Erdbeeren mit Sahne waren ein echter Leckerbissen.
The fresh strawberries with cream were a real delicacy.
delicacy / treat
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delicacy
A particularly tasty and desirable food; a delicacy.
Die frischen Erdbeeren mit Sahne waren ein echter Leckerbissen.
The fresh strawberries with cream were a real delicacy.

treat
Figuratively, something perceived as especially attractive, interesting, or enjoyable.
Für jeden Oldtimer-Fan ist dieses seltene Modell ein wahrer Leckerbissen.
For every classic-car fan, this rare model is a real treat.
'Leckerbissen' (delicacy/treat) is made up of the adjective 'lecker' (tasty) and the noun 'der Bissen' (a small piece that you put in your mouth). So it literally means a 'leckerer Bissen' (tasty bite).
Die Pralinen waren kleine, aber feine Leckerbissen.
The chocolates were small but exquisite delicacies.
To emphasize that something is special, the word is often combined with adjectives such as 'echt' (real), 'wahr' (true), or 'besonders' (special/particularly). An 'echter Leckerbissen' is therefore more than just good food; it is a delicacy.
Der frisch gefangene Fisch war ein wahrer Leckerbissen.
The freshly caught fish was a true delicacy.
You can recognize the figurative meaning by the fact that it is not about food. Often the target group is named with the preposition 'für' (for) to show for whom something is especially attractive.
Das Fußballspiel war ein echter Leckerbissen für die Fans.
The soccer match was a real treat for the fans.
treat
Leckerei and Leckerbissen both refer to something especially tasty. Leckerei often emphasizes a small food one treats oneself to as an indulgence. Leckerbissen places more emphasis on the food being exceptionally good and highly desirable.

Nach dem Mittagessen genießt Lena die seltene Praline als besonderen Leckerbissen.
After lunch, Lena enjoys the rare praline as a special delicacy.
Nach dem Mittagessen gönnt sich Lena ein Stück Schokolade als kleine Leckerei.
After lunch, Lena treats herself to a piece of chocolate as a little treat.