Separate drumettes and wingettes of chicken wings. Prick them with a knife or fork to enhance flavor. For boneless chicken breast or thighs, cut into bite-sized pieces.
Remove the strings and trim both ends of yardlong beans. Then, cut them into 5-cm (2-inch) pieces.
Heat 3 tbsp cooking oil in a pan. Stir-fry red curry paste, julienned finger roots, and sliced chili until fragrant.
Add chicken and stir-fry for 3 minutes to absorb flavors. Then, add yardlong beans and stir-fry for 1 more minute.
Pour 1 cup of water into the pan, season with fish sauce, soy sauce, sugar, and MSG (optional).
Cover the pan with lid and simmer until sauce thickens.
Add holy basil (or Thai basil) and julienned Kaffir leaves. Mix well.
Serve hot with steamed rice.