Bring milk with sugar and 1 pinch of salt to the boil. Stir in semolina and let it swell at low heat for about 5 minutes. Remove from the stove.
Finely chop the chocolate. Separate eggs. Stir egg yolk into the hot semolina. Beat egg whites until stiff.
Halve the semolina mixture. Mix one half with chocolate and cocoa. Fold half of the beaten egg white into the light and dark semolina.
Drain pears and possibly halve them. Place in a flat greased casserole dish. First spread chocolate semolina, then light semolina on top. Bake in the preheated oven (electric cooker: 175°C/circulating air: 150°C/gas: level 2) for approx. 25 minutes.
Decorate with lemon balm, chocolate rolls and pears.