Dark Chocolate Mousse with Raspberry Puree

"Recipe adapted from Julia Child's Mastering the Art of French Cooking. We used dark chocolate because we love it, but the recipe works fine with milk chocolate as well. In the recipe we used orange bitter, which any cocktail making household hopefully has, but in case you don't feel free to use an orange liqueur instead of the bitters and brandy. And if you don't have an espresso maker, use a strong coffee instead. The recipe is quite easy, but it does require a bit of hand whipping to develop the mousse's desired fluffiness. Great for an arm workout or it may also be good time to bust out the hand mixer...."