Peel and wash the potatoes and cook them in boiling salted water for about 20 minutes. Clean, wash and chop the soup greens very finely. Bring soup greens, lentils and stock to the boil and cook over a low heat for 10-15 minutes.
Season to taste with salt. Rinse fish cold and pat dry. Sprinkle with lemon juice and season with salt and pepper. Turn in flour and fry in hot fat on each side for about 5 minutes. Drain the potatoes.
Wash the chives, rub dry and cut into small rolls. Sprinkle over the potatoes. Arrange fish fillet with lentil vegetables and potatoes on plates.