I just grate my carrots and finley shred the cabbage and onion, then add extra light mayo at 1/2 a syn per tbsp and a little free yogurt. You don't have to use yogurt you could just do all mayo.
I usually whisk the mayo and yogurt seperately in a bowl and sometimes add a little water if it looks too thick then pour it over the veggies and mix!!
Just play around with the mayo/yogurt till u get the taste u like.
When I saw your post I just had to look up a recipe that I made during the summer for coleslaw and see if I could make it SW friendly. I suceeded so you will find the recipe on my blog. You should definately make this, much better than any other I have made before
when is made coleslaw, after about 3 hours loads of water had collected at the bottom and was really disgusting, i'd made a large batch though, do just have to make enought to eat or does yours keep in the fridge?
I usually shred all the veg, and keep them in a tupperware box in the fridge they can last up to a week if they are dry,
then I mix the ammount I want with extra light mayo and add a little mustard or tabasco for a bite depending on what i am eating it with
Like Sandra said I would just dress the coleslaw as you need it, that way it won't go all watery. You can just keep the veg and dressing seperate until you want to eat it