This is my attempt at making a beer as delicious as the amazing Plum Porter by Titanic Brewery.
I've brewed this once and it made a very nice beer but lacked some roast character. I think this is because I relied on the Carafa special and amber malt for the roastiness and it was missing a bit of chocolate or roasted barley. Not normally being a big fan of dark beers I was a bit afraid of using these ingredients but if I were making it again I would add 150g of chocolate malt. I also need to look into the amber malt which I have used before and had a much bigger malty hit from. I bought it from the same shop but I wonder if they changed suppliers as it didn't have the same impact on the beer.
I stewed the plums and then added them for the last 10 minutes of the boil as I didn't want to end up with a sour beer. After fermentation I couldn't really detect a significant plum flavour at all so used some natural plum essence http://www.uncleroys.co.uk/natural-flavours/natural-plum-essence.html.
It is potent stuff and after trying an unflavoured pint and adding drops of it till I thought the level was right, i went for 100 drops into 22L in the bottling bucket. I think this was a bit too much at least for my taste. The plum aroma was very strong. The flavour was about right but the aroma was too intense for a beer. If I make it again and I add the chocolate malt I would reduce the plum essence to 75 drops. If I made this recipe again with the lower roastiness I would cut the plum essence back to 60 drops. I'm sure this is a matter of personal taste though.
The yeast I used was actually Brewlabs Essex strain which attenuated a fair bit lower than I planned at 64%.