Variation for a steeped grain plus malt extract version:
Enter the desired volume at the end of the boil. The volume units can be either liters, gallons, or US barrels.
Select the preferred unit of measurement for the inputs and outputs. Metric uses liters, grams, and kilograms. US uses gallons, ounces, and pounds. US Barrels (31 gallons = 1 barrel) is in barrels, pounds, and ounces.
Enter the anticipated mash efficiency percentage. If this is not known, try the following values based on the sparge method: Steeping (50%), No-sparge or brew-in-a-bag (65 to 75%), Batch sparge (80%), or Continuous (fly) sparge (85 to 90%).
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Guinness Draught is an iconic stout from Ireland.
Guinness has a "tang" that is difficult to replicate. The recipe suggests fermenting 19 ounces of wort (for 5 gallons) with lactobacillus and brettanomyces. This should be gently heated to 160F (71C) for deactivating these organisms, then add to the main batch before packaging.
Irish ale yeast is recommended. Other English ale yeasts are possible substitutes.
The Brew Your Own Big Book of Clone Recipes, (2018), Guinness Draught, p. 107
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