Mix the sugar, the cacao and the egg yolks. Heat the milk, add the yolk mixture and reheat slowly until it thickens but don't boil. Chop the chocolate in pieces and dissolve in the hot milk. Add the cream and stir well. Freeze in an ice cream machine or in the freezer (stir every hour).
Split the eggs. Mix the sugar and the egg yolks. Heat the milk, add the yolk mixture and reheat slowly until it thickens but don't boil. Add the cream. Grate the rind of the lemon and press the juice out. Add to the milk mixture. Beat the egg whites until fluffy. Stir them carefully through the rest of the ingredients. Freeze in an ice cream machine or in the freezer (stir every hour).
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