Crush the chocolate and plate fat. Place in a freezer bag and melt in hot water. Peel 1 banana and cut into pieces. Cut a corner off the freezer bag. Cover the banana pieces on parchment paper immediately with the chocolate. Leave to dry
Mix the soured milk, mascarpone and vanilla sugar. Season to taste with icing sugar. Puree the rest of the banana and lemon juice and immediately stir into the soured milk. Mix the cream in
Fill 4 bowls. Decorate with the chocolate bananas and possibly mint