In a large salad bowl combine all the ingredients for the salad EXCEPT for the mango and avocado. Gently toss to combine.
In a medium-sized bowl combine all ingredients for the creamy yogurt dressing. Season to taste with additional salt and pepper, or lemon juice, as needed.
When ready to serve, peel and chop the avocado and the mango and combine with the salad. Top each salad with the desired amount of yogurt dressing, a squeeze of fresh lemon, and sesame seeds, if desired.