We're staying at their house while they're on holiday so they're not here for me to ask them.
My boyfriend says the jar has been there for as long as he can remember and he's never seen them used and never noticed the amount in the jar increase or decrease. They're on the worktop next to the teapot and the sugar which are used multiple times daily.
It just seems so random. He has never considered why they're there.
Any ideas?