Sadly their website doesn't provide much help:
Pitch Black Porter
This brew is available on a seasonal or limited basis.
A very smooth and delightful dark ale
Rich and creamy with little or no aftertaste
Try contacting the brewer, many of them are happy to help out homebrewers. If that doesn’t work try brewering a big-ish porter and then adjust your recipe and re-brew to get closer (is there any particular character of the beer you really enjoy?).
Sorry I couldn’t provide more help, good luck.