On 2010-05-09, Tim W wrote:

It isn't really beer imho, since it is fortified beyond the strength
obtained by fermentation. They claim it is beer because they don't add
alcohol or distill anything but the strength is increased by freezing out
the water. That's an additional process which is not part of traditional
beer making.

I might try a bottle though.

I can't say for certain, not knowing the process, but higher alcohol
levels can be obtained by natural brewing. I know that up to 25% can
be reached by re-adding starch (grain) and more and more strains of
yeast that are resistant to dying at normal alcohol levels.
Basically, they are force feeding/fermenting the brew to higher and
higher alcohol levels. Sammy Adams Utopia is one example.

nb