Flavour of the month
Definition 1 of 1
Pro Tip 1/3Popularity Spike
Indicates a quick rise in popularity, generally not lasting long. 
Vegan burgers are the flavour of the month in our cafeteria.
Pro Tip 2/3Sudden Change
Shows how tastes or trends change quickly, without predicting the next 'flavour'. 
He was once the flavour of the month, but now fans cheer for the new player.
Pro Tip 3/3Temporary Interest
Used for things or people that attract brief but intense attention. 
The detective series was the flavour of the month last summer.