To prepare dressing, combine first 7 ingredients in a large bowl, and stir well with a whisk.
Steam Brussels sprouts, covered, 8 minutes or until tender. Drain and dice.
Bring water to a boil in a medium saucepan; gradually stir in couscous. Remove from heat; cover and let stand 5 minutes. Fluff with a fork. Add Brussels sprouts, couscous, carrot, raisins, and pine nuts to dressing; toss well.