Chop chocolate and put into large glass bowl. Place a strainer over top of the bowl and set aside.
In a small bowl of a stand mixer whisk egg yolks and sugar until pale, about 2 minutes. Set aside.
Pour first amount of cream into a small saucepan, place over low heat and bring to a simmer.
Slowly pour hot cream into egg yolk on low speed to avoid cooking the eggs.
Pour mixture back into the saucepan on low heat and stir with until it thickens slightly.
Pour hot egg mixture into the strainer over the chocolate. Using a spatula press on the solids in the strainer then scrap the mixture from the bottom of the strainer into the bowl. Remove the strainer and stir constantly until the mixture is smooth and all chocolate is melted. Set aside.
In the small bowl of a stand mixer whip the whipping cream until stiff peaks form. Fold half the whipping cream into the chocolate mixture to lighten. Then fold in remaining whipping cream until smooth.
Divide white chocolate mousse into shot glasses, liqueur glasses, sherry glasses or martini classes. Refrigerate for 1 hour.
Top with a tiny amount of raspberry syrup and a single raspberry and serve.