Cut chicken breast into small cubes and toss with cornstarch and salt.
Deep-fry chicken in hot oil until golden brown and crisp; set aside.
Whisk soy sauce, honey, vinegar, garlic paste, and water in a small pan.
Simmer sauce for 3 minutes until thick and syrupy.
Toss fried chicken pieces in the glaze, transfer to a platter, and garnish with toasted sesame seeds.