A tasty cabbage, onion, and red, yellow and green pepper slaw from a magazine clipping. Make-ahead; cover and refrigerate for up to 24 hours. Keeps well in the refrigerator. Great for picnics and pot lucks. Use a mandolin to thinly slice vegetables or use the fine slice blade of a food processor. I usually add a couple teaspoons of sugar to the dressing mixture but that is just personal preference.