Dark grains are perhaps some of the most interesting ingredients for home brewing beer – they offer an explosion of flavor and color. This week, I step off the beaten path and explore some alternative ways to use dark grains when brewing beer.
[NOTE: I’ve since published an updated (simpler) method for accomplishing the same effect with dark grains here.]
After last week’s podcast interview with Gordon Strong, I was revisiting some sections in his new book Brewing Better Beer (Amazon link), when I came across a discussion of dark grains that sparked this week’s topic. Gordon refers also to a paper on steeping dark malts from Mary Anne Gruber of Briess Malting, and much of the material presented here is summarized from his book.
What’s Different about Dark Malts
For the purpose of this article, I will use the term dark malts to refer to roasted grains and malts such as Chocolate, Black Patent and Roasted (Black) Barley. One could also include very dark roasted specialty malts such as Chocolate Wheat, Carafa, and Special B.
What is unique to these malts is that they have been roasted to the point that they have no diastatic enzymes and also that whatever fermentable sugars are present in the malt have already been broken down during the roasting process. As a result they do not actually need to be mashed. Steeping these malts is sufficient to release their flavor and remaining sugars.
If you understand this basic fact, you can now treat them (to borrow from Gordon Strong’s analogy) like coffee. Whether you mash the dark grains or steep them in some other stage, the character of the dark malt flavor is driven more by the steeping time (assuming the water is sufficiently hot) than anything else. Also, like coffee grains, if you steep your grains for a long time you will get a more acidic and bitter flavor profile.
Mashing Dark Grains
Most all grain brewers mill and mash their dark grains with the rest of their grains. As many mashes last 60-90 minutes, this can lead to a more acidic and bitter flavor profile and in some extreme cases even an astringency (used tea bag) flavor. Think for a moment of what would happen if you steeped coffee for 90 minutes to brew your morning cup. This bitterness is accentuated if the pH of the mash has not been adjusted to the correct level (pH too high).
To be fair, mashing dark grains can be a plus in many styles. Dark grains are acidic, and do play an important role in lowering the pH of the mash for many styles. This lowering of the pH (5.2 is ideal for the mash) reduces the astringency and creates a much better beer overall. Also bitterness from the grains is an important flavor component in many styles such as Porters, Schwarzbier and Stouts.
Adding Dark Grains to the Vorlauf (Recirculating)
The vorlauf is the recirculated wort typically drawn at the start of the sparge – usually the first few quarts of runoff for a home brewer. This first runnings is then recirculated back to the top of the grain bed as it typically contains a high percentage of grain particles. In this variation, one does not mash the darkest grains, but instead steeps them in the vorlauf at the start of the sparge process and then recirculates the steeped wort back through the mash tun.
The advantage of this method is that is avoids the long hot steep of the mash, and the dark wort from the vorlauf is recirculated through the mash tun again further reducing astringency. However, since the resulting wort is still boiled for an extended time it can still result in some harshness particularly for styles where the bitter profile of dark grains is undesirable.
Steeping Dark Grains
A third method is to steep dark grains separate from the mash, and then mix the resulting “grain tea” after the boil. This is perhaps the most innovative of methods as it allows you to very finely crush the grains like coffee (they no longer need to be mashed), and also to vary the water used, steep time and temperature to achieve a desired flavor profile. I liken this method to making a dark grain coffee or dark grain tea where you decide precisely how it is brewed.
Mr Strong recommends a water to grain ratio of 2 quarts per pound of grain for steeping. There are three basic options: hot steeping, cold steeping, and boiling.
Hot steeping is much like making coffee. The finely ground grains are mixed with hot water in the 165 F (74 C) range and steeped for 5-10 minutes (depending on profile use) and then strained with a coffee filter or kitchen strainer. The dark extract is then chilled and added to the fermenter at the start of fermentation.
Cold steeping is akin to making cold brewed iced tea or cold steeped coffee. In this case the grains are mixed at room temperature and left to steep for a day or more, before adding them to the fermenter. In most cases this results in a milder flavor than hot steeping – like cold coffee. If possible, consider boiling the water ahead of time for a short period to sterilize it and also remove oxygen before cooling and adding the grains. NOTE: I recommend pasteurizing the cold steeped tea at 170 F for 10 minutes after you have steeped it to prevent possible infection or bacteria from the grains if you plan to add the tea directly to the fermenter.
A final option is to perform a short boil and add the grains at the end of the boil (tpypically 5-10 minutes before the end of the boil). This is often done by simply adding the grains at the end of the regular wort boil rather than creating a separate boil.
The bottom line is that because of the nature of dark roasted grains, they need not be mashed and therefore can be added at any point in the brewing process prior to fermentation. Steeping dark grains separately from the mash will generally result in less acidity, astringency and a little less color. While a dark roasted bitter coffee flavor may be desirable for certain styles such as Stouts, Scwarzbier and Porter, steeping the dark grains separately may be an ideal solution for those brewing milder styles. The techniques outlined above also provide more flexibility to precisely control the flavor and color that dark grains add to the beer.
Related Beer Brewing Articles from BeerSmith:
- Steeping vs Mashing Dark Grains Revisited – A Beer Brewing Technique
- Steeping Grains for Extract Beer Brewing
- Astringency when Steeping Grains for Malt Extract Beer Brewing
- Late Hop Additions and Hop Oils in Beer Brewing
- Schwarzbier Recipes – German Black Beer
- Sweet Stout and Milk Stout Recipes
- Hop Tea and Sampling Your Beer Brewing Hops
- Brewing an Irish Stout Beer Recipe
Don't make another bad batch of beer! Give BeerSmith a try - you'll brew your best beer ever.
Download a free 21 day trial of BeerSmith now