The chocolate must first be chopped into small pieces, so that it will melt evenly. If you leave it in large chunks, the outside surface will melt long before the center begins to soften, and the melted portion will stay hot too long which can ruin it. Use a heavy serrated knife (or a chocolate chopper) to shave off shards of chocolate; these can then be chopped again with the knife, or transferred to a food processor fitted with a steel blade and pulsed briefly; be careful not to let the chocolate melt in the processor bowl.
Flavorings can be added at several points in the process. Some herbs and spices (like rosemary, lavender, and fennel seeds) can't be used whole; their textures would spoil a satiny ganache. These should be infused into the cream after it is heated, then strained out before it is poured onto the chocolate. Or try the method preferred at Bouley for many of their flavored ganaches: cold infusion, where the ingredients is ground or chopped and blended with cold cream, then allowed to sit overnight. This modern technique, used with mint, Earl Grey tea leaves, and coffee beans, is believed to eliminate bitter flavors that may develop during traditional hot infusion. Liquid flavorings, like fruit purées, liqueurs, and alcohol-based essences like vanilla extract, should be added to the warm blended ganache; their flavors would be altered by the hot cream.
To the chocolate lover, however, flavorings are beside the point. A pure, plain ganache is luxury enough. There is no compromise, no adulteration, only the welcoming acquiescence of cream-softened chocolate.
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