42
Then add a dose of cold water to the coffee press to rinse
the hops further, stir the hops again to extract more flavour
compounds, plunger again and add another lot of green
water to the WilliamsWarn.
You can also try leaving the hops in the bodem for a few days
in a fridge to maximise extraction before pressing and adding.
You can, of course, use less or more than 50g (1.8oz). You can
also try combining different hop varieties together. But please
be aware that after the brewery has been filled to the 23 Litre
mark with cold water, we want a wort temperature of about 25°C
(77°F) for the yeast. So do not add too much hot water via the
hop tea. If you want to soak an extreme amount of hops, it would
be preferable to use water near 25°C (77°F). This green hop tea is
full of hop flavours and aromas and will add complexity to any brew.
ADDING HOP BITTERNESS
To add extra hop bitterness, you need to boil hops.
For WilliamsWarn brewers, the easiest way is to boil some
hops in 1L of water and then transfer that to a French
coffee press to plunger it and filter it before adding to the
brewery (as described in the aroma hop section above
and shown in Figure 59).
The amount of extra bitterness you add depends on 2 aspects:
A. The amount of alpha-acids in the hops
B. How long you boil for
All hops have an alpha-acid level that is measured and stated
on the hop packet. These get converted into iso-alpha acids
when boiled and these are the bitter compounds in beer. The
longer you boil, the more bitterness you make.
'Bittering hops' usually have a high alpha-acid content
(e.g. 10-15%) and aroma hops usually a low amount
(e.g. 4-10%). However you can use any hop to add bitterness.
The bitterness level ranges for most beers range from
around 10 for American and Asian lagers to 70 BU’s for
IPA’s and Stouts. Guidelines are given by the BJCP at this
link http://www.bjcp.org/stylecenter.php
If you want to increase hop bitterness levels for your own
personal preference, you can use our Excel Tool (download
from our website) or several web-based tools.
For example,
http://www.hotv.org/tools/hopbitterness.html
http://www.realbeer.com/hops/IBU.html
http://www.brewersfriend.com/ibu-calculator/
On these sites you will be asked to insert
Final wort or beer volume: 23 Litres (5 Imp Gallons,
6 US Gallons)
Wort specific gravity: 1.000 (we are boiling in water)
The alpha acid content for each hop used (read the
packet - from 4%-16%)
The amount added (1 oz is 28g)
The time boiled (1-60 minutes)
Note: “Hop Utilisation” should be calculated for you.
Alternatively, you can use the chart below to discern how
long to boil your hops for.
Example 1
For every 10g of a 10% alpha-acid hops boiled for
30 minutes in 1 Litre of water (which is then filtered in a
French Press and added to the WilliamsWarn with the other
ingredients in Stage 2), 12 bitterness units will be added to
the final beer.
Example 2
For every 10g of a 14% alpha-acid hops boiled for
60 minutes in 1 Litre of water (which is then filtered in a
French Press and added to the WilliamsWarn with the other
ingredients in Stage 2), 22 bitterness units will be added to
the final beer.
0
0
5
5
10
10
15
15
20
20
25
25
16.0%
14.0%
12.0%
10.0%
8.0%
6.0%
4.0%
30
30
35
40
50
55
60
45
Boil Time
Bitterness Units added
BITTERNESS UNITS ADDED PER 10 GRAMS
(0.35OZ) OF HOPS OF DIFFERING ALPHA ACID %
(WHEN BOILED IN 1 LITRE OF WATER AND ADDED TO 23 LITRES OF WORT)
Содержание BrewMaster
Страница 3: ...PART ONE YOUR PERSONAL BREWERY...
Страница 14: ...PART TWO MAKING YOUR BEVERAGE WITH THE STANDARD BREWING METHOD...
Страница 39: ...PART THREE MAKING BEVERAGES WITH THE ADVANCED METHOD...
Страница 45: ...PART FOUR APPENDICES...
Страница 78: ...TROUBLE SHOOTING THE WILLIAMSWARN PERSONAL BREWERY...