Arrange arugula wagon-wheel fashion on six large plates. Unmold couscous in center of plate. Garnish with reserved orange sections. Drizzle with Citrus Vinaigrette. CITRUS VINAIGRETTE: Peel orange, grapefruit, lime and lemon. Cut each into segments over a large stainless steel bowl to catch excess juices. Carefully dice segments, cutting not crushing them. Add oil, vinegar, soy sauce and chili sauce to fruit juices in bowl; whisk to blend. Add peppercorns, ginger, cilantro, diced fruit and salt; stir to combine. Makes about 1 1/4 cups.