"Phred" continued:
> It seems to vary a bit. According to one reference
> <http://www.lynsted-society.co.uk/html/traditional_measures.html>
> it's 1 quart (1.136 litres).
>
> Then again, according to another it's rather larger:
> <http://www.unc.edu/~rowlett/units/dictF.html>
> "flagon -- a traditional unit of liquid volume, generally equal to the
> wine (or U.S. liquid) gallon (about 3.785 liters). A flagon is a
> large, narrow-necked pitcher or bottle."
>
> As a measure, it seems to relate to booze rather than other liquids.
> (The traditional alco's picnic: A flagon [of plonk] under the nearest
> bridge.)

Are you sure the recipe calls for a flagon and not a vessel?

<and not to mention the chalice. Oy! >