Thai Chicken Garlic Stir Fry (Gai Pad Kratiem)

Ingredients

• 300g skinless chicken thighs, sliced 1cm thick
• 5 cloves garlic, chopped
• ½ cup cooking oil
• 4-6 coriander stems, cut into 2cm batons
• ¾ tbsp sugar
• ¾ tbsp oyster sauce
• ¾ tbsp light soy sauce
• ½ tsp fish sauce
• ½ tsp dark soy sauce
• ¼ tsp white peppercorns
• ¼ tsp black peppercorns
• 2 cloves garlic
• 4 coriander roots
• 2 red chillies
• ½ tsp sugar
• ¼ tsp salt
• 3 tbsp white rice vinegar