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Split mash recipe formulation

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tgif

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I am looking at doing a "split mash" where I mash 10 gallons worth of base grains, then split the wort to make two different beers and I have a bunch of questions about doing this. First off, does anyone have experience with doing anything like this?. The beers I am looking to make are a dry/Irish stout and some sort of kettle soured blonde. The grain bill(s) are the following:

Combined Mash:
10 lbs Golden Promise
3 Lbs Flaked Barley

Stout Grains:
10 oz Roasted Barley
6 oz Dark Crystal
6 oz Chocolate Malt?


I have an electric BIAB system from High Gravity Brewing that allows me to make 10 gallon batches, and I was planning on performing the mash as usual, running off 6 gallons or so of wort for the blonde, then continuing with the stout as if it was the only beer I was making. My question with this is should I just cap the mash with the dark grains or should I perform a steep like with extract brewing? I was planning on finely grinding the roasted barley to get more color and flavor out of it but I am not 100% set on this. Also, would 6oz of chocolate malt be a good addition to the existing grain bill? I would then add 1.5 oz 5%AA EKG and boil for 60 minutes, chill and pitch wyeast 1028 (London Ale). I am open to other yeasts if you think there would be better options. This beer is going in a keg with beer gas.

To finish the blonde I would return the ~6 gallons of wort from earlier to the kettle. I would then add a culture of lactobacillus and hold the temp at 110 or so until the beer is sour enough. After that I would bring it to a boil, add .5oz 5%AA EKG and boil it for 15 minutes to kill any bacteria. At flameout I am planning on adding 1 lb orange blossom honey, then chilling and pitching wlp 644 (Sacch brux trois). Following primary I am thinking about either adding fruit (apricots?) or dry hopping with Amarillo and/or Citra prior to bottling. I might split the batch and do half of each.


My remaining questions are: Is a high percentage of flaked barley going to have a negative effect on a pale beer? Is the 15 minute boil addition of EKG on the pale beer a good/bad idea, and does the type of hop that I use matter?

General thoughts on the secondary additions to the blonde ale are welcome too.

Thanks for the suggestions and let me know if I can clarify anything else.
 
I've decided to forgo the sour mash and I'm making a starter of lacto and pitching it at the same time as the wlp644. Brewday scheduled for NYE. Will continue to post updates.
 
I ended up with 5 gallons of 1.042 wort for the sour and about 3.9 gallons of 1.050 wort for the stout (I adjusted down to 1.042 by dilution). Overall the brew day was successful, and my efficiency was around 90%. The stout should be ready to keg in a few days, and I am going to transfer the sour to secondary with some apricots this coming weekend.
 
I split the sour up into 3 different batches: 2 gallons got 3lbs apricot puree, 2 gallons got 1 oz amarillo and 1 oz citra dry hops and I added the bottle dregs from Avery 22 (brett drie) to the last gallon. The base beer was fairly sour (somewhere between lemonade and OJ) and had a tropical fruit taste that resembled under ripe starfruit. The stout turned out really well, and it sort of reminds me of Murphy's. The dark grain character is a bit subdued compared to other stouts I've had, but that's not surprising given their short time in the mash. If I do this again I may do a hot steep of the dark grains after the mash instead.
 
I'll also be posting tasting notes when I get around to sitting down and doing some detailed analysis.
 
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