Peel carrots and onions and chop them coarsely. Cover both with ham, laurel, cloves and pepper in a large pot with water. Bring to the boil, cover and cook over a low heat for 1 3/4-2 hours. Leave to cool in the broth
Mix the baking mix and yeast. Add 350 ml lukewarm water. Knead everything smooth with the dough hooks of the hand mixer. Cover and leave to rise in a warm place for about 45 minutes
Roll out the dough on a little flour to a thickness of about 1 cm (about 40 cm Ø). Brush with egg white. Remove rind and fat from ham. Whip into the dough. Press the edges well. Place on a baking tray sprinkled with flour. Score the dough crosswise. Cover and let rise for about 15 minutes.
Brush the dough with water. Bake in the preheated oven (electric oven: 200 °C/ convection oven:175 °C/gas: level 3) for 45-50 minutes. Serve with gherkins, mixed pickles, beetroot and horseradish cream