Roughly chop the chocolate and melt in a hot water bath. Finely chop the candied orange peel. Line a baking tray with baking paper. Pour chocolate on it and spread thinly. Sprinkle with chopped candied orange peel and leave to dry.
Whip the cream until stiff. Mix mascarpone with quark, sea buckthorn, sugar and vanilla sugar. Fold in cream.
Break the dried chocolate into large pieces. Layer the cream and chocolate leaves alternately in four small dessert glasses or bowls.