Step 1
Preheat the oven to 425°. In a large bowl, mix the vegetable oil with the five-spice powder. Add the chicken, season with salt and pepper and toss. Arrange the chicken on a foil-lined baking sheet. Roast for about 35 minutes, turning twice, until cooked.
Step 2
Meanwhile, in a blender, combine the hoisin sauce, chile sauce, rice vinegar, stock, ginger, garlic and sesame oil and puree until very smooth. Transfer to a saucepan and simmer until slightly thickened, 5 minutes.
Step 3
Transfer the chicken to a bowl and toss with the sauce, until completely coated.
Step 4
Preheat the broiler and position a rack 8 inches from the heat. Return the chicken to the baking sheet and broil for about 10 minutes, brushing with the sauce and turning occasionally, until glazed and sticky.
Step 5
Add the sesame seeds to a bowl. Dip the chicken in the seeds to coat; serve.