basically you make soup with free veg, from memory-
onion, garlic, carrot, swede, peppers, celery etc (no point ones so not potato, parsnip, sweetcorn, etc), tinned tomatoes etc etc
blend til smooth/chosen consistency
and eat as much as you like!!!
though sadly I struggle with soup without lots of fresh bread and butter!
There is a delicious recipe in one of my mags from last year for a soup with sweet potato & squash & chilli flakes - it's 3 point per portion (and not a cheap option) but it's bloody gorgeous!
WW is all about manipulation