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How do you amplify the yeast flavor in bread?

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Due to the range of comments, I think some clarification might help. Are you looking to increase the yeasty flavor that yeast produces in bread, or the actual flavor of the yeast itself? –  sourd'oh Aug 30 '13 at 16:53
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3 Answers

Use lots of yeast, and short fermentation times. Prefer cake yeast over the dried types.

Fresh yeast has a specific taste and aroma, which disappears during fermentation, giving you a different, bready taste, which is not the same as yeast taste. Pro bakers are normally trying to achieve perfect fermentation, using low yeast amounts and long fermentation types. Household recipes are trying to take a more convenient route, preferring speedy fermentation (so baking times are reduced) and lots of yeast (because 1. this allows for even quicker rising, and 2. some decades ago, yeast quality was not so good, and you had a chance that the culture in a cake you purchased was barely alive, so it wouldn't rise if you used the minimal amount pro bakers with fresh daily supplies went for). This results in lots of unfermented yeast, which gives homemade breads a specific yeasty taste. While pro bakers will try to avoid it, many people associate the taste with pleasant experience of homemade bread made by a beloved family member, and like having it in their own bread.

So, use cake yeast. About the highest amount you can get away with would be 10% (50 g cake yeast per 500 g flour). But if your bread starts getting a whiff of ammonia, reduce it a bit. Ferment at warm temperatures (30°C is good, yeast starts slowing down over 35) and wait for volume doubling at each stage - should take 30-40 minutes per stage. Be careful to not overproof, because with this ammount of yeast, the dough is fickle, and may not rise if proofed for too long.

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What is it about cake yeast that is unique or special compared to the more modern, more easily stored, types of yeast? Given that the yeast will grow exponentially throughout the ferment, what is it about the cake yeast that retains a unique enough charactar to significantly alter the flavor of the final bread compared to instant or dried yeast? All sources I have ever reviewed indicate they are freely interchangeable in terms of outcome; the only differences I have seen are whether proofing is recommended, and how you integrate them into a dough. –  SAJ14SAJ Jul 30 '13 at 11:30
    
In my experience, it produces much more yeasty taste. I suspect that this is because it has so much non-yeast dry mass which has taken on the aroma. I agree that when used in the way the sources recommend (small yeast amounts, long fermentation times), the difference in taste is too small to be noticeable, but when going for a yeasty taste, the OP will use the exact opposite process, and then it matters how they started. And besides, exponential growth is not so fast in the first 5-6 generations, and yeast divides on a 20-min cycle. –  rumtscho Jul 30 '13 at 12:27
    
I guess I just don't like short fermentation except for pizza dough... –  SAJ14SAJ Jul 30 '13 at 12:29
    
You can also get deactivated yeast that is specifically formulated to add a yeasty flavor to dough without doing much else. –  sourd'oh Aug 30 '13 at 16:39
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There are a couple of methods to increase to yeasty flavor and development in a bread:

  • Use a long, slow rise or fermentation, usually refrigerated
  • Use a recipe that starts with a preferment or biga, that is fermented once to develop flavor prior to the main fermentation
  • Select recipes with fewer additional ingredients or enrichments like eggs, butter, sugar, and so on that would mask the yeasty flavor.
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I use the 'old dough' or pate fermentee method, which involves taking a portion of dough - around a fifth works well - from a batch after the first prove, covering it and leaving it in the fridge. Next time you bake bread, take the aged dough and incorporate it into the new dough.

You can keep the cycle going by taking some of this dough and storing it again. Over time this will intensify the flavours in your bread. The old dough will keep fine for 3-4 days in the fridge or a few weeks in the freezer (if freezing then take it out a couple of hours before you need to bake). I've been doing this for the last few months and get a much better taste in my bread.

I'd also recommend using fresh yeast as mentioned above, I find this gives a better flavour than the dried or instant yeasts.

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