The last time we had an extended power outage here I tried making browines (no hash) on the propane grill. I managed to produce some chocolate scented charcoal briquets.
Get yourself a cast iron dutch oven and try again. That or Coleman does make a nifty little oven for those stoves.
They're handy to have for extended power outages. You can actually bake things on one of them Colemans.