All languages in the world contain rules of expressions. Being able to express appropriately in a foreign language requires having a specific approach to the signification of idiomatic expressions.
The meaning of French expressions doesn't necessarily follow the logic of the words used in the sentence.
Enjoy more about French language! From now on you can discover and learn some new fun French expressions related to food. Share your favourite with your friends, teacher, students...
C'est du flan
Literally: it's flan (custard)
Meaning: it's fake, it's not serious