What is it that you find about a step mashed beer that you prefer?
I sometimes speak in broad terms about ALL beer but I’ll keep it specific to the Trappist ales I like to brew.
I find I can get the same fermentability from a 30 minute, 2 β rest start as most seem to get from a single infusion at 60+ minutes. I’ll usually start the mash with 20 minutes at 145-146 °F then step it to 148-149 °F for another 10-15 minutes. If I want to eek out that extra 1-2% of Extract (if I hadn’t hit it already) I’ll step to 153 °F for about 5-10 minutes.
This generally nets me 100% Conversion η in about 30-40 minutes. As always you have to let the malt sheet give you the details about the specific base you are using. I typically take refractometer readings through the β rests to see how Extract is developing.
So far we have a beer that is extremely fermentable and only requires about 30 minutes in β rests to hit the attenuation limit. In the beers I brew, I’m looking for 85+% AA, so sugar and an extremely fermentable wort help.
I also want the beer to be full bodied. So I then step up from the β rests to the α/dextrinization rest at 162 °F. I stick there for 30 minutes with no fluctuation.
I now have a beer that is highly fermentable and full bodied.
The next thing I want to pursue is foam. I want mousse like foam that persists and has excellent lacing throughout the drinking session. Much of this comes from other process points but I’m adamant about including, and holding, a mashout at 171-172 °F for 10-15 minutes. The terminology gets squirrelly here for some, i.e. mashout, mashoff, etc. but in the end it’s a mashout rest at that temp. This rest promotes glycoproteins synthesis and aids in head retention, foam quality, appearance, etc.
So now I have a highly fermentable, full bodied, glorious foam (in more ways than one) having beer and a total mash time, including step times and a dual β rest of about 85 minutes or so.
The blog says Duvel at least is using simple infusion, but I'm interested in what you see as the contribution from step mashing?
I always worry a little bit that those breweries might continue with that process even if it isn't necessary because it's traditional. My understanding at this point is that much of the step-mashing was because grains weren't fully modified, and modern malts don't benefit.
I'm new to Belgian Beers, so I'm happy to step mash if there is a purpose, but I wish there was a more clarity on the impact it has on the final beer.
See above for the detailed explanation of what I do.
As for the malt, modification really doesn’t factor in at all. Yes, “modern malts” convert more thoroughly with single infusions than they did “back in the day” but as another thread on this site pointed out, “modern malt” is a bit of a misnomer. Malt has been “modern” since De Clerck and that was 75 years ago. Every beer you’ve ever drank or heard about was made with “modern” malt.
In short, high modification doesn’t preclude step Mashing.
It’s down to equipment as well. If you can’t step in a controlled fashion with direct fire, I’d recommend just single infusion. Part of the magic is sweeping through temperature ranges at a certain rate (generally accepted to be 1 °C per Minute) and basically hitting all the temps in between rests.
It’s not for everyone and you aren’t a hack if you don’t do it. I just feel, and so do many modern breweries, traditional or not, that it makes a difference.