The "French biscuit".

At Harry's school they have a lunchtime French club. Harry did French - albeit fairly limited! - when he was at nursery, and was not that bothered about losing lunchtime play to do more. 
Except for the fact that the students get rewarded with a French biscuit at the end of the lesson. Harry had somehow managed to sample said biscuit and declared
a) it was delicious
b) it was sourced at Waitrose. 
We have been looking for the elusive French  biscuit for about 12 months now! Today, Harry finally spied the biscuit packet he thought was the right one. (White). Duly purchased, he is very very pleased...and they are indeed delicious!