Thinly slice the capsicum. Thinly slice the celery on an angle. Trim the beans, then halve on an angle. Pick the coriander leaves, discarding the stems. Halve the lemon.
Step 2 — Marinate chicken
Combine the red galangal seasoning, yoghurt and 2 tsp oil in a large bowl and season with salt and pepper. Add the chicken and turn to coat.
Step 3 — Char lemon
Heat a chargrill pan over medium-high heat until hot. Cook the lemon halves, cut-side down, for 3 mins or until charred. Remove from the pan. (If you have the space in the chargrill pan, you can cook the lemon and chicken together to save time.)
Step 4 — Cook chicken
Cook the chicken for 5-6 mins each side until cooked through. Remove from the pan and rest for 3 mins.
Step 5 — Stir-fry vegetables
Meanwhile, heat 2 tsp oil in a medium frypan over high heat. Stir-fry the capsicum and celery for 2 mins or until just tender. Reduce the heat to medium-high, add the beans and stir-fry for a further 2-3 mins until softened but still with crunch.
Step 6 — Get ready to serve
Add the peanuts, half the chilli flakes* (reduce for less of a chilli kick, or omit them if you prefer), 1 tsp soy sauce, 1 tsp white wine vinegar and 1 tsp honey to the vegetables and toss to combine. Divide the vegetables and chicken among plates and drizzle the chicken with any resting juices. Scatter with the coriander and serve with the lemon.