Wang-less Chocolate
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Tech Help, Tips, Tricks, Techniques
If only it were that simple, everyone who has a PhD in an general field would know the answer 8-) not to diminish your friend's field, but i get the impression he's a generalist, and not a specialist. It's a bit like going to your family doctor for specific advice on cardiomyopathy. There may be a general familiarity with the topic, but i'd not wager my life savings on the advice.
The bitterness could be a result of the fermentation or the roasting, but it also may have absolutely nothing to do with either. Chocolate mfr requires SUCH a holistic understanding of the process it's often difficult to attribute blame or success on any one single process step. And for what it's worth, the baking soda's actually a very, very good idea. I've used it a time or two myself.
Do you have any control over your bean sourcing and processing, or are you simply working with beans that you ordered? If the latter, i'm afraid it may be be exceptionally difficult for you to affect any change, depending on what's causing the problem. 4 days of fermenting may be ideal for some beans, and 6 days ideal for others. "Ideal" is also a pretty ambiguous term - which is idea, a red car or a blue car? Much of "ideal" is personal preference, so if you have examples of finished chocolates you find "ideal" that helps to pinpoint what's required to get there.
Which origin beans are you using, do you have any firsthand knowldge of how they're processed (vs the guy who sold them to me said they were xxx), have you cut 100 of them in half to look at their color, etc?
Often times defining what attributes you want before you start is helpful, vs starting and then saying 'it's not what i want, what can i change'...