I've been experimenting with making my own parti-gyle recipes and must say it is as difficult as expected. I made two so far, the second is just about to finish fermentation. I created some schematic graphs to show the process, because otherwise it is practically impossible to discuss this way of brewing here in Germany.
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My goal is to get three to four really different beers from one brew, as Fuller's does with theirs(or did, rip Chiswick Bitter). So in the first attempt I went with a simple grist and did two very different aroma hoppings in the boils as well as some additional burtonisation in the stronger gyle. The weakest gyle then got that commercial caramel with 3000 EBC that I recently purchased. The Strong Bitter was dry-hopped from the beginning of fermentation.
Tasting notes: I was not completely happy with the first four beers. Caramalt creates a really sweetish flavour that was apparent in all but the weakest beer. Fermentation with WY1098 was sluggish in the weaker beers, so I had some overcarbonisation. The yeast also precipitates significantly less than WLP007, which is one of my favourite yeasts.
The caramel was nice, so the Dark Mild was really as I expected. I served that and the Strong Bitter at a homebrew convention and got some good reviews. Most preferred the Strong Bitter, especially because of the dry hop. The 10 minute Tango addition had some grassiness however, which was not to my preference. The Pub Ale was right in the middle and not too overpowering. Liked that the most. The Barley Wine was intensely bitter and I could taste the gypsum, so I won't do this extra burtonisation again. But it might get better over time, so I'm keeping some bottles.
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The second brew is for the 10th anniversary of the Dusseldorf Homebrew Club. A friend has a bigger setup than me, so we used it to make two beers. He will serve the Stout, I'll serve the Dark Mild, both from hand pumps. The Imperial Stout was an unexpected extra because we had too much first gyle. WLP007 this time and one of the beers is already bright, after one week of fermentation. Really love the flocculation on that one. Really looking forward to how these turn out.