If you are absolutely sure that it couldn't have been contaminated because of improper sanitation, then I would say your fermentation temperature was too high for too long, and the yeast produced off flavors.
I was thinking of I making a beer using African ingredients. I know I want it to be a wheat based beer, but there are a number of other ingredients i'd like to experiment with. Does anyone have any suggestions? These are the ingredients I have to choose from:
Squash
pumpkin
bell peppers...