Wash the chicken filet and pat dry. Cook the lentils for about 10 minutes in boiling salted water, drain. Wash and clean spring onions and cut them diagonally into rings. Wash, quarter, core and cut the apple into pieces.
Season chicken filet with salt and pepper. Heat 1 tablespoon of oil in a pan. Fry the fillet for about 3 minutes on each side, remove and keep warm. Roast curry in the frying fat and deglaze with the broth, bring to the boil.
Mix the starch with a little water. Thicken curry sauce with it, bring to the boil again. Heat 1/2 tablespoon of oil in a frying pan, fry the spring onion and apple pieces briefly. Add the lentils. Cut the chicken filet open, arrange with the lentils and the curry sauce and garnish with an apple wedge.