To Prep
Whisk the fish sauce, sugar and crushed garlic in a bowl. Add the wings and toss to coat.
Refrigerate for 3 hours, tossing the wings occasionally.
To Cook
Heat the 2 tbsp of oil in a small skillet. Add the minced garlic, cook over moderate heat for about 3 mins until golden. Drain on paper towels.
Heat 2 inches of oil to 350°C in a large pot. Pat the wings and dry on paper towels. Reserve the marinade.
Put the corn starch in a shallow bowl, add the wings and turn to coat.
Fry the wings in batches until golden and cooked through for about 10 mins. Drain on paper towels and transfer to a bowl.
Simmer the marinade over in a small saucepan over moderately high heat and add ½ cup of water until syrupy for 5 mins.
Strain over the wings and toss.
Top with coriander, mint and fried garlic. Serve immediately.