First, make the curry sauce. Heat one tbsp of rapeseed oil in a saucepan, sauté the onions, garlic and carrots until soft and lightly caramelised or for about eight minutes.
Add the ginger and cook for another 30 seconds. Remove from the heat, then stir in the curry powder and turmeric. Fold in the coconut milk and honey and season well.
Cover and simmer over a low heat for 5 - 8 minutes.
Then, flatten the chicken filet to even and thin enough to cook evenly later on.
In the meantime, mix the flour with the soy sauce and egg in a large bowl to create a light coating batter. In a second bowl, place the breadcrumbs. Dip the chicken pieces in the flour mixture, then egg mixture, and to finish in the breadcrumbs, turning until well coated. Place in the air fryer. Spray with oil and and cook for 12-16 minutes until cooked through. (depending on the sizes of the chicken pieces.)
Place some boiled rice in serving bowls, add some curry sauce and top with the katsu chicken.
Serve with the cucumber, herbs and lime wedges.