Rosemary extract was made on 1/19 to go with this beer. We'll measure and inject it into the keg according to taste tests. We used 15 grams of rosemary leaves. Have not measured volume, but started with around 225mL of vodka.
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Some sediment of seemingly soluble state was in there too, and didn't all stay dissolved. We added more vodka to that and let it sit. The extract is in one of the brown bottles in the wood crate for extract stuff.
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On 3/11 we tried the extract with beer samples (we took a quart of beer out during the process).
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The numbers are the extract/beer ratio.
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0.0185 way too strong
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0.0097 still a bit strong
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0.00292 subtle, light note - not enough
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0.0062 still too strong, but getting close
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0.00456 what was good - can taste both.
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So that's 1:219.3 ratio of rosemary extract to beer.