Apple Salad with Maple-Mustard Vinaigrette

Ingredients

• 1/4 cup thawed frozen apple juice concentrate
• 2 tablespoons cider vinegar
• 2 tablespoons canola oil
• 2 tablespoons spicy brown mustard
• 2 tablespoons maple syrup
• 1/4 teaspoon salt
• 1/8 teaspoon pepper
• salad:
• 9 cups torn mixed salad greens
• 2 large tart apples, chopped
• 1 small red onion, thinly sliced
• 1/3 cup chopped walnuts, toasted