That's what I've been doing this afternoon on a very pleasant day's holiday - making Salted Butter Caramel Macarons. It is very hard getting these little biscuits right and the whole process took about 4 hours.
If you're interested the recipe is here: www.girlcookinparis.blogspot.com/search/label/Macarons
The oven is rubbish so out of 50 halves that went in only 20 were
usable and 10 perfect and looking like this:
The recipe is basically Pierre Herme, and you can buy his version in Selfridges for £1.70 each! After 4 hours I understand why!