Wash and clean the strawberries and cut them into small pieces. Select the raspberries and wash them if necessary. Mix strawberries, raspberries, 2 tablespoons sugar and liqueur. Leave to stand at room temperature.
Break the chocolate into 8 pieces. Grease 4 large cups (each containing approx. 225 ml), sprinkle with some sugar and chill. Bring milk, butter and vanilla sugar to the boil. Sprinkle in semolina while stirring constantly.
Simmer while stirring until the mixture separates from the bottom of the pot. Separate the eggs. Stir the egg yolks individually into the semolina while it is still hot. Beat the egg whites and 1 pinch of salt until stiff, adding 50 g sugar.
Fold the beaten egg white into the semolina. Pour some semolina mixture into each of the cups and add 2 chocolate pieces each. Spread the remaining semolina on top. Place cups in the fat pan of the oven. Fill the fat pan to a good 2/3 with water.
Bake in the preheated oven (electric oven: 200 °C/ convection oven: not suitable/ gas: level 3) for 25-30 minutes until the surface is golden brown. Turn soufflés out onto plates, dust with icing sugar and arrange with berries.