To make the red wine vinaigrette:
Pour the red wine vinegar into a large jar along with the lemon juice, sugar, kosher salt, garlic powder, and the black pepper.
Add the olive oil, cover the jar with the lid and shake vigorously until the vinaigrette is well blended.
Makes about 1-½ cups of vinaigrette.
To make the salad:
Combine the wild rice* with the broth and butter in a small saucepan. Bring to a boil over medium heat. Cover the pan, reduce the heat to low and continue cooking for 45 minutes.
Keep the pan covered and remove the pan from the heat. Let the rice steam for 10 minutes then stir in the orange juice. Leave the pan covered while you prepare the salad.
Mix the greens with the scallions, the red onions, and the oranges.
Add the rice and drizzle enough of the vinaigrette to coat the greens, about ¼ to ⅓ cup.
Toss in the blueberries and the blackberries and gently toss to mix into the salad.