Beer on steriods: How to fortify beer

DJ Spiess — Fri, 04 Jan 2008 03:58:52 +0000

If you are looking to increase the alcohol content of your beer to produce something like a barley wine, there are a few easy methods. Making a very strong beer without fortification (like Samuel Adams Utopias ) will be covered in another article.

Fortify your beer

The first method to fortify your beer is to just add whiskey to your beer. Whiskey is a distilled hopless beer (sort of), and is the best choice for flavor. The idea for using whiskey is to add “like with like”. This probably is not the best method, but if you age your beer for a while with oak chips, this could result in a nice winter warmer. We would recommend stouts as the best choice for this method, but we’re sure someone out there will prove us wrong with an awesome fortified pale ale.

You can other alcohols like Everclear. When you choose your fortifying spirit, it’s better to use less of a higher proof alcohol than more of a lower proof alcohol. Everclear could be a good choice, because you have to add less. Adding less to your beer means you will dilute your beer less. Everclear is often used to make port wine by homebrewers for this reason. Everclear may be too neutral. It depends on what you are looking to accomplish.

The spirit should be added after fermentation. If you add it too early, not all of the sugars will ferment. If you are aiming for a “port-like” beer that is slightly sweet, adding a high proof spirit late in the fermentation is your best bet.

The best way to calculate the correct amount of alcohol to add is to use a Pearson’s Square .

Fortifying your beer will makes the alcohol content much higher

Freeze your beer

Another method to fortify beer is to freeze the beer, and then remove the ice. Technically this falls under “fortification” according to the laws in the United States, and thus is illegal. Other countries might have different laws regarding this (let us know in the comments if you know the laws for your country). We have not heard this rule enforced for a home brewer in the United States; however consider this your warning and our disclaimer. Freeze fortification works because water and alcohol have different freezing points (32 F 0 C and -178 F -117 C respectively). Your freezer is not cold enough to freeze alcohol.

The method of freeze fortification is very simple. Take your fermented wort and place it in a clean, sanitized bucket. Seal the bucket and place in a freezer overnight. Make sure there is room in the bucket for the ice to expand. Do not use glass, as this could have disastrous results if you do not leave enough space. The next morning, remove the block of ice. The remaining liquid is fortified ice beer.

The results of these methods may produce jet fuel initially, and may require extended aging. Just place them away after bottling, and try a bottle until the harsh notes of the alcohol mellow out. If you make a great one let us know, or better yet send us a bottle!

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Quick Lesson: How to use a Pearson’s Square

DJ Spiess — Fri, 04 Jan 2008 03:53:11 +0000

The easiest way to calculate the amount of alcohol required for fortification is to use a Pearson’s Square.

It's as easy as ABC...D

First determine the alcohol strength of the wort or must that you want to fortify. You can do this by measuring the specific gravity before and after fermentation. Once you have the alcohol strength, place that number in position A.

Next note the alcohol strength of the fortifying spirit in position C. This is the alcohol strength of the brandy, whiskey, or Everclear that you are adding.

Decide the final alcohol strength you are targeting for your fortified drink. This number should be between the values chosen for A and C. This number should be placed in position X.

Calculate B and D. B is the difference between C and X (C – X). D is the difference between X and A (X- A).

Finally take the ratio of B over D (B / D). This is the ratio you will use to add to fortify.

Here are the steps with an example:

1)   Determine A – Assume your initial alcoholic strength is 10%.
2)   Determine C – Assume you are using 180 proof alcohol which is 90%
3)   Determine X – Assume we are targeting a 25% beverage
4)   Calculate B – (B = 90 – 25 = 65)
5)   Calculate D – (D = 25 – 10 = 15)
6)   Calculate the ratio B/D – B/D = 65/15 =13/3

13/3 is your final ratio. This means for every 13 parts of your initial beverage, you need to add 3 parts of your fortifying spirit. For example if you had 39 liters of wort, you would add 9 liters of your fortifying spirit.

[Edit 5-19-2008: Corrected values]
[Edit 5-17-2010: Corrected result]