Barley Wine

History

Characteristics

The richest and strongest of ales, alcoholic, full-bodied, and generally low carbonation.  This is a sipping beer.  Many feature characteristics that are estery, fruitiness, and well aged (as much as 25 years).  The natural maltiness and sweetness is balanced with high hop bitterness.  American versions tend to be very hoppy and alcoholic, while British versions are less so.
Statistics O.G.:  1.085 .. 1.120, averaging toward the high side 
F.G.:  1.024 .. 1.032 
IBU:  50 .. 100, British fall on the lower end, American at the upper end of the scale
Alc.:  8.5 .. 12.2 % (by volume)
Color: 14-30 SRM, ranging from rich gold to very dark amber
Water pH: 4.1 .. 4.6
Malt Well-modified British pale ale malt is the more traditional choice.  Domestic, German, or Belgian pale malts will also make an excellent beer.  A mixture of light and amber malts extracts will give color in the desired range.  Even sugar can make up to 15% of extract.  Crystal malt is not necessary due to the large amount of pale malt.  Only use roasted malts if you are trying to achieve an imperial Russian stout.
Infusion mash at 150 .. 155 degrees (F) to create a wort with high fermentation.
Hops For classic British style, English hops such as Fuggle and Kent Goldings are the best choice, especially for aroma and dry hopping.
For American style, try Cascade and Columbus for aroma.
Late hop additions and dry hopping will add complexity.  
(Note: high gravity worts have lower hop utilization rate, so you may need to use more hops than usual).
Yeast Attenuative ale yeast (ferments wort thoroughly) with high alcohol tolerance is best. (E.g. Liquid Wyeast 1056 (American ale).  Mixing varieties often creates a more interesting beer.
Some brewers will use a wine yeast (e.g., Pasteur Champagne yeast has given good results).
Aerate wort well & pitch an especially large volume of yeast.
Ferment at 58 - 70 degrees (F)  
(Note: age for at least 2 months before bottling. 1/2 cup of priming sugar should be sufficient for carbonization)