For vinaigrette, whisk together all ingredients in small bowl. Set aside.
Bring water to boil over high heat in medium saucepan. Stir in wheat berries and salt. Reduce heat to low, partially cover and let simmer for 1 hour, or until wheat berries are tender. Drain and rinse; allow wheat berries to chill.
Combine onion, oranges and wheat berries in large bowl. Season with salt and pepper. Toss with vinaigrette. Rest 30 minutes before serving. Garnish with watercress and cilantro. Serves 4.