1. Mix chilies, shallots, fish sauce, syrup, lime, sour mango in a mixing bowl and stir to combine.
2. Heat oil then fry fish until golden and crisp. Set aside to drain.
3. Pour the vegetable oil, oyster sauce, fish sauce, sugar, stir and fry the ingredients together.
4. Top snapper with the sauce that you fried before.
5. Place snapper on a plate. Served with a spicy salad dressing.