This slaw keeps well for several days, so bring it out as an additional side dish for lunch on another day. Recipe courtesy of Victoira Shearer.
Up to 2 days ahead: In a food processor, finely chop cabbage, onion, and green pepper. Place vegetables in a large bowl. Meanwhile, combine sugar, oil, salt, mustard, celery seed, and vinegar in a small saucepan. Bring to a boil, whisking constantly. Remove from heat and cool. Pour vinegar mixture over vegetables and mix well. Cover slaw with cling wrap and refrigerate until serving.