Combine boiling water and sun-dried tomatoes in a bowl; let stand 30 minutes or until soft.
Drain and chop.
Combine tomatoes, olives, and next 4 ingredients (olives through garlic) in a food processor; process until finely chopped, scraping sides of bowl once.
Cook cauliflower in boiling water 2 minutes.
Drain and rinse cauliflower under cold water.
Combine tomato mixture, cauliflower, onion, salt, and pepper in a bowl; toss well.