Clean the chicory, wash it. Cut out the stalk in a wedge shape. Boil up about 3/4 l water, broth, lemon juice and sugar in a large pot. Cover the chicory and cook for about 5 minutes
Peel and chop the onion. Grate the cheese roughly. Lift the chicory out of the cooking water and pat dry. Wrap 1 slice of turkey breast around each. Place in a greased ovenproof dish. Measure out just under 1/2 l of the chicory water
Heat the fat. Sauté the onion in it. Dust with flour and sweat. Deglaze with chicory water and milk while stirring. Bring to the boil and stir in half the cheese. Let simmer for about 5 minutes, season to taste
Pour the sauce over the chicory and sprinkle with the remaining cheese. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C / gas: level 3) for 20-30 minutes until golden brown. Wash and chop the parsley and sprinkle on top