Using a food processor shred cauliflower using shredding disk.
Put cauliflower and 2-3 tablespoons water in a micro-wave safe dish or bowl, cover dish with plastic wrap or other cover and microwave it on high for 5 minutes. Uncover and let cool. Drain and set aside.
While the cauliflower is cooking combine other vegetables (olives-parsley) in a large salad bowl. Toss.
Add the cauliflower and toss.
In a small jar combine oil, garlic, vinegar, mayonnaise, and salt and pepper. Whisk or shake jar.