Wednesday 22 March 2023

Let's Brew Wednesday - 1870 Truman Imperial Stout

You asked for an Imperial Stout recipe and here it is. From Truman, whom you might not associate with the style. The version from Barclay Perkins being rather more famous.

Imperial Stout wasn't just brewed by those two breweries. Courage also produced one before WW I. And there was a bizarre trade in Scotland for London-brewed Imperial Stout. So much so that, between the wars, Barclay Perkins brewed a special (weaker) version just for the Scottish market.

Here we are at Truman’s strongest Stout, Imperial. Except that it isn’t. Going against naming conventions, it’s weaker than Double Export Stout.

The grist is the same as Running Stout and Double Stout. There’s a reason for that: it was parti-gyled them. Quite a low brown malt content and quite a lot of black malt. As in most of the other Stouts, apart from Double Export Stout.

As the mashing details are cryptic even for Truman. There were at least three mashes, but there could have been more.

All American hops, two types, both from the 1869 harvest.

Unlike in 1861, it was racked into a vat. Number 2 vat, to be precise. I can’t have been very big, as only 50 barrels were brewed. 

1870 Truman Imperial Stout
pale malt 17.75 lb 88.75%
brown malt 1.50 lb 7.50%
black malt 0.75 lb 3.75%
Cluster 120 min 3.50 oz
Cluster 60 min 3.50 oz
Cluster 30 min 3.50 oz
Goldings dry hops 1.00 oz
OG 1084
FG 1023.5
ABV 8.00
Apparent attenuation 72.02%
IBU 155
SRM 29
Mash at 148º F
Sparge at 170º F
Boil time 120 minutes
pitching temp 60º F
Yeast Wyeast 1099 Whitbread Ale

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