Cutting the mustard (chocolate)!

Our lovely offspring abandoned their (not so ) ageing parents and indulged in a spot of retail therapy in Norwich, the home of mustard. They thought of us in their travels and bought us this tea towel and a bar of mustard chocolate.
Hmmm, mustard chocolate. Actually, it's very nice - good dark chocolate with a faint tickle of mustard left on the palate.
Thank you lovely offspring!