Wash the chervil, dab dry and put 2 stems aside. Chop the remaining leaves finely. Peel and wash the carrots and slice into 1-2 mm thin slices. Peel and wash the potatoes and slice them.
Mix chervil, condensed milk, cream and 100 ml broth and season with salt, pepper and nutmeg. Layer carrots and potatoes in a greased casserole dish and pour over the liquid. Grate the cheese and sprinkle over it.
Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 35-40 minutes. 10 minutes before end of cooking time, clean, wash and drain the salad. Wash and clean the radishes and cut into thin slices.
Mix mustard, vinegar and 2 tablespoons of broth, fold in the oil. Season vinaigrette with salt, pepper and a little sugar. Pour the vinaigrette over the salad. Garnish the casserole with chervil. Add the salad.