Cut chicken into very small pieces and toss in a bowl with soy sauce.
2
Heat butter in a non stick fry pan and stir fry leeks for 2 minutes. Add carrot and stir fry for 1 minute. Add potato and chicken stock and season with salt and pepper. Bring to the boil and cook on medium heat for 15 minutes.
3
Blend half the soup to a puree and return the pureed soup to the pan. Add corn kernels and simmer for 5 minutes. Add chicken pieces to hot soup and leave on gentle heat for 5 minutes without boiling it. Stir in parsley and serve.