Peel and grate sweet potato, chop meat, apple and walnuts into small pieces.

Heat the cooking fat, add the chicken and season with the salt and pepper. Cook until browned, 2-3 minutes. Turn the chicken and add walnuts and cook for about 2-3 minutes. Shake the pan occasionally so the walnuts don't burn. Add the sweet potato, apple and chilly flakes and cook, stiring often, until the chicken is fully cooked.

Add the apple juice and mix all ingredients together. Add spinach and cook for another 30 seconds.