Beat the juice, oil, vinegar, water, mustard, garlic and black pepper in a medium bowl with a whisk or a fork.
Divide the lettuce among 4 salad bowls. Top with the mango and avocado slices. Spoon 2 tablespoons of the vinaigrette over each salad. Serve immediately.
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Mango & Avocado Salad with Açai Berry Vinaigrette recipe