HEAT oil in small saucepan. Add garlic; cook 1 and stir 1 min. Stir in 1/2 cup barbecue sauce, oyster sauce and hoisin sauce. Bring to boil, stirring frequently. Simmer on medium-low heat 5 min., stirring occasionally. Remove from heat. Reserve for tossing with the cooked wings.
BRING chicken broth and remaining barbecue sauce to boil in Dutch oven or large deep skillet. Add wings; simmer 10 min., stirring occasionally. Drain; discard liquid.
HEAT oil to 350ºF in large saucepan. Toss chicken with cornstarch; gently shake off excess cornstarch. Carefully add chicken, in batches, to hot oil; cook 8 to 10 min. or until done, turning after 5 min.
PLACE wings in large bowl. Add reserved barbecue sauce mixture; toss to evenly coat wings. Place on platter; sprinkle with onions and sesame seed.