Steam cauliflower until tender, but not mushy

Combine mayo, mustard, vinegar, salt, pepper and sweetener. Mix well (taste to adjust seasoning)

Put cauliflower, celery, carrot, onion, pepper and olives into a bowl. Pour mayo mixture over and combine gently.

Chill overnight, or longer (the longer it sits, the more flavourful the dish will be)

Before serving, add more dressing to preference.