Drain the mandarin oranges and reserve juice. Dice peaches and pour the reserved mandarin juice with peaches in a bowl. Drain peaches and sprinkle with honey. Stir in broccoli florets, mandarin oranges, and red onion with peaches and set aside. For the dressing, combine tahini, orange juice, horseradish and salt. Pour dressing over the broccoli mixture, stirring to coat all ingredients. Serve with chopped cashews on the side. Best if served immediately or chilled for 2 hours prior to serving.