Shred the vegetables in a food processor, or by hand if you don't have one.
Make the dressing using the oil and vinegar and season to your taste with sugar and salt. If you find you need more or less dressing, adjust the quantities to suit.
Pour over the vegetables and mix together well.
Leave for a couple of hours in the fridge before serving.
If you find you need more or less dressing, adjust the quantities to suit.