Peel green mangoes, julienne into thin matchsticks
Julienne carrot, thinly slice cabbage
Julienne bell pepper and snap peas, thinly slice onion
Optional: soak onion in ice water 10 minutes, drain, pat dry
Wash and dry herbs, remove leaves, tear larger ones
Make dressing: whisk fish sauce, lime juice, vinegar, sugar, water until sugar dissolves
Add garlic, chilies, sesame oil to dressing, stir well
Taste and adjust sweet, sour, salty, spicy balance
Combine mango, carrot, cabbage, pepper, peas, onion in large bowl
Toss gently to mix
Add cilantro, mint, basil, reserve some for garnish
Pour ¾ of dressing over salad, toss thoroughly
Let sit 5-10 minutes for flavors to meld
Taste, add more dressing if needed
Just before serving, top with peanuts and fried shallots
Garnish with reserved herbs and chili slices
Serve immediately