Chop the couverture and melt it on a hot water bath. Coarsely chop the nuts. Mix the chocolate coating, nuts and fine orange fruit. Peel the pineapple (if necessary cut off some slices for decoration and put aside) and cut into pieces. Cut out the middle stalk. Mix mascarpone, sugar, vanilla pulp, orange juice and liqueur.
Whip the cream until stiff and fold into the cream with the pineapple pieces. Put half of the cream in a bowl. Spread nut chocolate over it. Spread the rest of the cream on top. Decorate as you like with pineapple slices