Chocolate-Raspberry Roulade

This raspberry roulade is a thin sheet cake spread with raspberry jam and whipped chocolate ganache, sprinkled with fresh raspberries, then rolled up and drizzled with chocolate.  It's the chocolate lover's alternative to yesterday's Blueberry Roulade, and the ganache is crazy good.

You'll want to plan this cake in advance, since the whipped chocolate ganache needs to be chilled for hours. It can also be made a few days in advance.  I've been leafing through Alice Medrich's Bittersweet, and I like her explanations for why chocolate behaves in a certain way, or her adaptations when using a chocolate with a higher or lower cacao percentage.  One thing Medrich points out for this recipe is not to worry if the melted chocolate and cream look too soft to spread, because it won't stiffen until it's whipped -- and it will stiffen more after it's chilled.

I'm going to miss farmers market berries when the cold hits!

Out of these three roulade combinations I've posted, my favorite has been raspberries and cream.  Because I like raspberries more, and the plainer whipped cream really lets the subtle summery flavor shine through.  But this whipped chocolate ganache is so good I'm bookmarking it for other recipes, like piping on top of cupcakes or using as a filling between cake layers.  Use a quality chocolate to really appreciate the flavor.  I used Callebaut.