CestrIan wrote:Dr. Dextrin wrote:But I'm no longer believing that stuff and have started experimenting with yeasts like Fullers that produce a lot of dicetyl. My latest (a simple bitter modelled on Wadworth 6X - with just pale and crystal malts) has produced an amazing toffee flavour that I've never managed to achieve before, so I'm starting to think I'm on the right track.
However, temperature control during fermentation appears to be quite important as, also, is the ability to clear the yeast from the beer at the correct point in the fermentation by cooling (essentially this is to prevent the diacety rest taking place). I suspect all this needs to be done in quite a controlled manner for best results. There are enough variables to keep me busy for a while, so I'm definitely just at the start of the learning curve.
But I think this is a promising area to experiment with.
Hi DD! You say you're on the right track. How did you achieve the diacetyl toffee flavour in the 6X brew? Did you drop the temp to 17C like in the brewing network recipe?
No, not exactly, although maybe I did something similar by accident. My main intention in this experiment was to under-pitch to create some diacetyl and then try and drop the yeast out quickly at the end of fermentation to avoid any diacetyl rest taking place.
I don't have a fridge to ferment in, so I was relying on using a water bath and putting PET bottles of frozen water into it. That's actually not particularly effective, though, especially as the weather turned out quite warm, so I'm postponing further experiments until the colder weather.
What I actually did was initially fill the water bath from the cold tap, so the wort started at around 17C (which by coincidence seems to be about right), and then pitch a fairly small yeast starter. I then allowed the temperature to rise to about 20C. I was able to hold it at this temperature with the frozen water trick, although it probably varied by a degree or so either way. Then, once the fermentation seemed to be finishing, I cooled as far as I was able (probably to around 17 or 18C) and let the yeast settle. The Fullers yeast tends to drop out quickly anyway. Then I racked the beer off the yeast, primed with sugar and kegged it.
So compared to the Brewing Network temperature profile, I probably cooled a bit less and a bit later in the fermentation and didn't do the really cold bit at the end, but otherwise somewhat similar.