Finely slice your cabbage and cut it into manageable pieces. Use a cheese grater to grate your carrot. Combine in a colander and wash thoroughly. Use your salad spinner to dry it all.
Transfer this to a large bowl and add a small amount of very thinly diced onion. Cover this all with coleslaw dressing — I used a store bought dressing for this one. Salt and pepper to taste and you're done.