Place wheat berries in a medium-size saucepan and add 4 cups water. Soak overnight.
Drain wheat berries; add 4 cups water and bring to a boil. Reduce heat and simmer covered for 45 minutes or until tender. Drain.
In a large bowl, whisk together orange juice, vinegar, peanut oil, soy sauce, sesame oil and mustard. Stir in wheat berries, edamame, oranges, cucumber and scallions. Cover and refrigerate at least 1 hour.
To serve, stir well and spoon salad onto lettuce. Garnish each serving with peanuts.