For crispier chicken double fry the chicken. First fry the chicken on medium heat till the crust is light brown and chicken is cooked. Drain and keep aside. Once you are done frying everything, add the 1st fried chicken to oil placed on medium high heat and fry till golden brown. 2nd time it will be done quickly.
To serve the chicken crisp, keep the sauce ready and deep fry the chicken the 2nd time just before serving.
Sugar in the marinade helps to keep the chicken tender and juicy.