Cut the chicken into 1/2 inch cubes. Add chicken stock powder, 1/2 tsp blackpepper and 1/2 tsp salt. Stir to combine. Marinade chicken at least 15 minutes.
Thread 4 pieces of chicken onto the skewers. Grill for 5 minutes on first side and 3 minutes on the other side. Set aside.
Crush bird's eye chilis, 1/2 tsp salt and 1/2 chicken stock powder with pestle and mortar until smooth. Add juice of half lemon and 1/2 tsp lemon zest. Stir to combine.
Slice shallot thinly. Add juice of 1/4 lemon. Stir to combine.