Carefully spread mixture evenly over chocolate layer. Cover loosely and chill six hours or overnight. Top with whipping cream. Refrigerate until ready to use. Make salad, removing heavy stems from spinach.
Tear leaves in bite-size pieces into salad bowl.
Arrange other vegetables on top of spinach. Cover and refrigerate about 2 hours. When ready to serve, remove garlic from dressing if left whole. Shake dressing vigorously. Pour dressing over salad and toss to coat and mix well.