Indian-Style Sweet Potato Salad

A delicious salad--and a unique (at least in my experience) method of dressing it. I did not do the rather fussy procedure with the onion--just sliced it very thin and added it--but otherwise followed the instructions precisely. (I will try the soaking/rubbing of the onion another time when I'm less hungry.) I ground cumin and coriander seeds and heated them in the oil--the scent is lovely. The combination of the cilantro and mint makes this a truly fragrant dish and a very pretty one.