In a large, deep skillet, heat 1/2 inch of oil until shimmering. Carefully add the chicken, one piece at a time, and fry over high heat, turning once or twice, until very browned and crisp, about 4 minutes. Drain the chicken on paper towels and immediately add to the sauce along with the scallions. Cook just until coated, about 30 seconds. Serve right away, with steamed broccoli and rice.