Working in batches, remove the chicken wings from the bowl and tap off any excess cornstarch mixture. Fry the wings in batches, turning them over a couple of times, until golden brown and cooked through, 6 to 8 minutes. Return the frying oil to 375°F between batching. Transfer the fried chicken to the wire rack and immediately season on both sides with salt and pepper. When all of the wings are cooking, transfer to a serving platter. Garnish with the crispy garlic and scallions, grate some lemon zest over the chicken and serve.