For this gai pad prik gaeng recipe (ไก่ผัดพริกแกง), once all your ingredients are ready to go, turn on your stove to low heat.
Add about 1 tablespoon of oil (น้ำมัน) to your wok or pan, keeping it on low heat, and you can add in about 3 tablespoons of Thai red curry paste before the oil heats up too much.
If your pan is too hot the curry paste will burn, so keep it on low heat and just stir fry for about 30 seconds.
After your red curry paste is hot sizzling and fragrant, toss in your chicken, and season with a bit of fish sauce (red curry pastes can taste different and be of different saltiness, so make sure you taste test and see how it is before adding fish sauce), and a pinch of sugar, and fry until the chicken is all the way cooked.
Finally, at the end, toss in your long beans and kaffir lime leaves, stir fry for about 30 more seconds and your marvelous gai pad prik gaeng (ไก่ผัดพริกแกง) is ready.