You need shallots, lemongrass, galangal, ginger, cilantro, garlic and lime zest in addition to chilies and turmeric to make authentic Thai chicken curry. This is how we did it at a cooking class in Chiang Mai.
2stalks lemongrasswhite portion only, peeled and thinly sliced
3shallotspeeled and quartered
4clovesgarlicpeeled
1one-inch knob gingerthinly sliced
1one-inch knob galangalthinly sliced
1one-inch knob turmericthinly sliced
4stalks cilantro(reserved the top leaves for garnish)
zest of one kaffir lime
2bird's eye chiliesstems discarded
To complete the dish
1tablespooncooking oil
1cupcoconut cream
1kilogramchicken leg quarters(2.2 pounds) each cut through the joints into three portions
1teaspoonpalm sugar
fish sauce
1small stick cinnamon
1 ½cupschicken broth
1 ½cupscoconut milk
To garnish
lime slices
cilantro leaves
Instructions
Using a mortar and pestle (or a mini food processor), grind all the ingredients for the curry paste.
Heat the cooking oil in a thick-bottomed pan.
Add the curry paste and saute (medium heat, of course), stirring often, until the solids start to separate from the oil.
Pour in the coconut cream and heat until bubbly.
Dump the chicken into the pan and stir to coat each piece with the curry sauce.
Stir in the palm sugar, a tablespoon of fish sauce and the cinnamon stick.
Mix the coconut milk with the chicken broth and pour into the pan.
When the sauce boils, set the heat to low, cover the pan and cook the chicken in the sauce for 30 to 40 minutes with occasional stirring, depending on how large the chicken pieces are.
Twice or thrice during cooking, taste the sauce and add more fish sauce, as needed.
Serve your Thai chicken curry topped with cilantro leaves and lime slices or wedges on the side.