Melt butter in a pot, stir in paprika powder. Wash chicken inside and out, dab dry and season with salt and pepper. Wash parsley and dab dry. Put 1/2 bunch of parsley aside.
Spread the remaining parsley stalks in the chicken's abdominal cavities and put 30 g parsley butter in splodges in each. Close the belly opening, tie the legs and wings together with kitchen string. Place the chickens side by side with the breast side up on a greased fat pan of the oven and spread with paprika butter.
Roast in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 1 1/4-1 1/2 hours. Brush with paprika butter every now and then. Clean the white cabbage, cut into quarters and cut out the stalk.
Cut cabbage into thin strips, wash and drain. Peel and finely chop the onion. Heat 1/2 tbsp. oil in a saucepan. Sauté diced onion in it. Bring vinegar, stock, salt, pepper and sugar to the boil, add 3 tbsp. oil.
Pour hot marinade over the cabbage, allow to cool briefly. Knead the cabbage well with your hands. Wash, clean and cut the peppers into pieces. Mix into the coleslaw. Cover and leave to stand. Pluck the remaining parsley leaves, chop them finely and add to the remaining paprika butter.
About 20 minutes before the end of the cooking time, brush the chicken with it and finish cooking. Remove the chicken and cut it in half with a pair of poultry shears. Arrange coleslaw and chicken on 4 plates.