1Cut the chicken thighs into bite-sized pieces.
2In a bowl, mix soy sauce, mirin, and sushi vinegar. Add chicken and mix well. Marinate for 15 minutes.
3Drain the chicken, reserving the marinade. Coat the chicken pieces with cornstarch until fully covered.
4Preheat the air fryer to 180°C (350°F). Lightly spray the basket with oil.
5Place the chicken in the air fryer basket in a single layer. Cook for 12 minutes, shaking the basket halfway, until golden and crispy.
6While the chicken cooks, prepare the dressing: squeeze the juice from half a lime, then mix with rice vinegar and brown sugar until dissolved.
7Slice the cucumber and carrot into thin strips using a vegetable peeler. Tear the Little Gem lettuce into bite-sized pieces.
8Toss the cucumber, carrot, and lettuce with the dressing.
9When the chicken is done, toss it with the reserved marinade and return to the air fryer for another 2 minutes to caramelize.
10Serve the crispy chicken over the dressed salad. Garnish with lime zest and lime slices.