What to do about Lumps in Chocolate

If you’re not careful, bittersweet chocolate—the best kind for a mousse—has a nasty tendency to form lumps. This sometimes happens when a small amount of liquid is added to melted chocolate. Even melting chocolate in a mixing bowl that isn’t perfectly dry can cause the chocolate to clump up into a thick and grainy paste. If this happens, just stir 1 or 2 tablespoons of water, coffee, heavy cream, or other liquid into the chocolate to smooth it out. But don’t add so much liquid that the chocolate mixture gets too thin, or the mousse won’t hold together.