1.  Remove outer leaves and trim stalk on cauliflower. Steam for 10 minutes or microwave on High for 4 minutes (cauliflower should remain crisp). Immediately rinse under cold water. Drain well.

2.  Combine yogurt, orange juice and tahina (if mixture is too thick, add a little more orange juice).

3.  Arrange onion rings over cauliflower.

4.  Top with yogurt mixture and sprinkle with orange rind. Garnish with coriander. Cut into wedges to serve.