Machine House Dark Mild

Batch size: 5 gallons (19 liters)
Brewhouse efficiency: 72%
OG: 1.036
FG: 1.008
IBUs: 20
ABV: 3.7%

MALT/GRAIN BILL
5.5 lb (2.5 kg) Maris Otter
8 oz (227 g) chocolate malt
5.2 oz (147 g) crystal 60L
5.2 oz (147 g) crystal 150L

HOPS SCHEDULE
0.45 oz (13 g) Progress at 60 minutes [11 IBUs]
1.4 oz (40 g) Progress at 5 minutes [7 IBUs]
0.4 oz (11 g) First Gold at 5 minutes [2 IBUs]

YEAST
Imperial A09 Pub or Wyeast 1968 London ESB

DIRECTIONS
Mill the grains and mash at 152°F (67°C) for 60 minutes. Vorlauf until the runnings are clear, then run off into the kettle. Sparge and top up as necessary to get about 6 gallons (23 liters) of wort—or more, depending on your evaporation rate. Boil for 60 minutes, adding hops according to the schedule. Chill to 68°F (20°C), aerate well, and pitch the yeast. Ferment completely, allowing the temperature to free rise as high as 80°F (27°C). For 5 gallons (19 liters) of wort, prime with 2.4 oz (68 g) of dextrose and rack into cask or bottles. Condition warm or at cellar temperature for 14 days. Optionally, add isinglass before tapping and serving.

BREWER’S NOTES
Clarity: Isinglass or other finings are optional in this case since this is a dark beer.

Priming: Instead of priming, you can rack into a cask when the beer is about 0.25–0.5°P from final gravity (i.e., at 1.009–1.010), but this really depends on the accuracy of your process. For homebrewing purposes, fermenting completely and priming is more reliable.

Carbonation: For cask, we are looking for 1.7–1.9 volumes of CO2, although for bottle conditioning we like to go a bit higher, to 2.0–2.2 volumes. Some breweries go a lot lower with cask (CAMRA—Campaign for Real Ale—recommends 1.1 volumes), although here in the United States, most other breweries seem to go way too high, in my experience. It’s really hard to pour through a beer engine any higher than 1.9, although venting allows some wiggle room. Carbonate to taste!

Brewday notes

1. Used 120 crystal as no 150. Also used Lalbrew premium series English style London yeast (dry)as no A09.
   
   Rest of brew day followed schedule. Sparged with 1 gallon of 153 degree water giving me 6.5 gallons pre boil. Put 4.75 gallons into fermenter. Chilled to 68 and OG was 1037 via refractometer, which was higher efficiency than standard.
   
   Gravity after 5 days was only 1020. Still 1020 after 7 days, so made a yeast started with a packet of Safe-05 and added that after 16 hours (2 liters of water, 4 oz DME).
   
   Good yeast activity from second pitch but after 4 more days gravity was still only 1015. Decided to keg anyways with 3 oz corn sugar. Total of 12 days in fermenter.
   
   After 3 weeks in the brown keg it’s drinking beautifully. Clear, lots of head, lightly roasted notes, smooth. Gravity still at 1015.