1. Preheat oven to 180° C.
2. In a casserole dish melt 30g butter then add ¼ cup stock. Lay chicory in one layer then sprinkle with prosciutto and place in the oven for 15 minutes.
3. Melt 50 grams of butter in a saucepan. Add flour and stir to remove any lumps. Slowly add the milk, stirring constantly until it has a smooth consistency. Season with salt, nutmeg and pepper. Add 1 cup of Swiss cheese and stir.
4. Pour the sauce over the chicory and prosciutto. Sprinkle the remaining cheese on top and place back in the oven for about 10 to 15 minutes until top is golden.