1Roughly chop the garlic and coriander roots/stems, then combine them in a blender with cumin seeds, ground white pepper, turmeric, oyster sauce, soy sauce, sugar, and salt. Blend until smooth.
2Slice through the meat of the chicken pieces to the bone to allow marinade penetration and faster cooking.
3Place chicken into a bag, add the marinade, and massage well. Let it marinate for one to two hours.
4Coat the marinated chicken pieces evenly in rice flour.
5Heat oil to 170 degrees Celsius (320 degrees Fahrenheit) and fry the chicken in batches for 8 to 10 minutes, turning occasionally to ensure even color.
6Remove chicken from oil and sprinkle with salt.
7Serve with crispy shallots, sweet chili sauce, and fresh coriander leaves.