I cannot say it often enough, my family adores sweet potatoes, and we are always on the lookout for a new way to prepare them. I love Moroccan cuisine, and this really epitomizes it. If you can get the harissa I heartily recommend it, the chili peppers are a poor substitute. If you do use chili peppers you should whirl them around a bit in the food processor to get the saucy texture of harissa. I completely left out the black olives and the capers (well, it did say "to taste", and in our house that means "none". Thanks, Friedel, I'll be making this again, for sure!