Use the rubber scraper to scrape the edges, rollers and other elements of the melangeur again so that everything is ground evenly. You now have a coarse, grainy cocoa paste. You can now leave the melangeur to run for at least 24 hours.
Depending on the type of bean, you can now decide whether to leave the lid off the melangeur or leave it on. The idea behind this is to get the bitter substances out of the chocolate. For example, if you have used a bean that is quite sour and bitter and you don't want these flavours in your chocolate, then conch the chocolate with the lid off. Have you ever driven past a large chocolate factory and smelled the wonderful aroma of chocolate and cocoa in the air? Well, these factories do nothing other than conching the couverture with an "open lid". Even if it's bitter, it's still the scent of chocolate.
If you have used a fairly fruity and mild bean, you can leave the lid on without any problems.
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