A thread on another forum about Hardtack reminded me that I still had one more biscuit and a little more pemmican. Experimenting a little, I pounded the hardtack and boiled it and the pemmican in a bit of water. The hardtack seemed to soak up the excess fat and the pemmican dissolved into its small bits. Added a pinch of cayenne and it made a passable stew. Far better than cold pemmican and hard biscuit!