Rice the cauliflower and prepare the other vegetables as detailed above.
In a small frying pan, add the cauliflower and 2 tablespoons of olive oil over medium heat. Saute for 4 - 5 minutes until just becoming tender. Set aside to cool.
In a food processor (or chop by hand), add the red onion, herbs, garlic clove, salt and pepper. Pulse until just chopped.
Stir through the cooled cauliflower, diced tomatoes and cucumber. Whisk together the dressing and pour on top.