I used a regular orange and just sectioned it with a knife. Next time I'll add the juices to the dressing and leave half the ramen out of the dressing (it gets soggy pretty fast, but soaking up the dressing is good) and top the salads with it for some crunch. Finely chopped the onion but thin slices of shallot would be good too. Will definitely make this again - served it as a side to a grilled pork chop and the combo was great.