Ingredients
1 head cabbage
1/4 red onion
1/2 cup sour cream
1/2 cup mayo
1.5 Tbsp cider vinegar
1/2 Tbsp mustard
1 tsp Splenda
First, slice up the cabbage and onion into very fine threads. Now separately mix together the sour cream, mayo, cider vinegar, mustard and Splenda. Mix everything together thoroughly, and let set in the fridge for 2-3 hours. That's it, you're all done!
So here's the question - just how low carb is cabbage? The answer - only 1.1g per half cup!! The tiny amount of onion you're likely to get in your average serving of coleslaw is negligible, let's say maybe .5g for those pieces. Mayo is 0.1g per tsp so that doesn't really count either.
So all told, I'd count this at 2.5g. It's probably not even that much.
Definitely count on coleslaw as being a side dish that you can enjoy and still lose weight!

Lisa Shea's Library of Low Carb Books