"six bars of Kendal Mint Cake"

Kendal Mint Cake
Creative Commons AttributionKendal Mint Cake - Credit: Christabelle
A good source of energy, popular amongst mountaineers and climbers. It is a glucose-based sweet product flavoured with peppermint produced in Kendal, Cumbria.

Kendal Mint Cake has been used on many famous expeditions including the Antarctic explorations by Sir Ernest Shackleton and by Edmond Hillary and his team when becoming the first to reach the summit of Mount Everest. You can check out the Wikipedia article here.