Why Dark Beer Deserves a Place in Your Brew Shed

Porter and stout never really left Lancashire. Long before the modern taproom boom, working men in Bolton, Blackburn and Bury were drinking dark, roasty ales that had far more in common with a modern porter than anything pale and fizzy. If you have cut your teeth on golden ales and pale IPAs, dark beer is where your brewing will suddenly grow up. It is also wonderfully forgiving: the roast character hides a multitude of small sins, and the beers reward patience rather than precision.

The terminology trips people up, so let us settle it. Historically, porter came first — a strong, brownish-black beer that leaned on brown malt. Stout began life as simply a stronger porter, "stout porter", before evolving into its own thing with roasted barley at its heart. In practice, a porter is smoother, more chocolatey and often a touch lower in alcohol; a stout is roastier, drier and more assertive. Both belong on your brewing bench.

Getting to Grips with the Dark Malts

Everything in a dark beer flows from the grain bill. Buy small quantities of each and taste them side by side — a pinch of each malt chewed with a sip of water will teach you more than any book.

• Brown malt — the historic backbone of porter. Dry, biscuity, faintly smoky, with a gentle coffee note. Use it generously and your beer will taste like the 18th century.
• Chocolate malt — smooth, rounded, cocoa and toasted bread. The gentlest of the dark malts and the safest place to start.
• Roasted barley — unmalted, sharp and distinctly coffee-like. This is the signature of Irish-style dry stout. Above about 10% of the grist it turns ashy and harsh.
• Black malt — intensely acrid and bitter. Wonderful in tiny amounts for colour adjustment, punishing in quantity.

A common mistake is to reach for every dark malt in the shop. Restraint pays. Two or three well-chosen specialities, plus a good English pale malt as the base, will outperform a muddled mix of six.

Building the Grain Bill

Start with a reliable pale malt making up 75–85% of the grist. For a porter of around 1.052, try 4.5 kg of pale malt, 450 g of brown malt, 350 g of chocolate malt and 200 g of roasted barley across a 23-litre batch. That gives you a beer sitting somewhere between the two styles, richly dark but not punishing.

For a drier stout, pull the brown malt back to 200 g and push the roasted barley to 500 g, keeping the chocolate malt where it is. If you want a softer, sweeter porter, drop the roasted barley entirely and let brown and chocolate malts do the work.

Mash warm and slightly thick — around 66–67°C for 60 minutes — to leave enough body to carry all that roast. Dark malts lower your mash pH, so if your water is soft, as much of Lancashire's is, add a modest amount of carbonate to the mash liquor. Three to four grams of bicarbonate of soda in 23 litres is usually enough to lift the pH back into the 5.2–5.4 range and stop the beer tasting thin and drying.

Watch your sparge. Roasted grains can produce a harsh, tannic edge if you run the liquor too hot or too long. Stop sparging when the runnings drop below about 1.010.

Hopping: Less Than You Think

Hops play a supporting role here. You want enough bitterness to stop the beer cloying, and little else. A porter should land between 30 and 40 IBU; a dry stout between 35 and 50; a hearty imperial stout can push towards 65 but needs the malt to match.

English varieties suit the style perfectly — earthy, spicy, gently resinous. An ounce of Fuggles at 60 minutes and a modest late addition of Goldings with ten minutes left will give you a clean, traditional bitterness with a faint herbal lift. Skip the enormous dry hop. Aroma hops fight roasted barley and usually lose, leaving a confusing beer that tastes of neither.

Fermentation and the Long Wait

Use a good English ale yeast and ferment at 18–20°C. Give it a couple of days at the warmer end once primary fermentation slows, which cleans up the diacetyl that dark beers sometimes throw. Then cool it down and be patient.

This is the part most home brewers rush. Porter and stout need four to six weeks of conditioning before the roast settles into something rounded. Bottle or cask it, keep it cool and dark, and taste it at fortnightly intervals. The difference between week two and week six is startling — the sharp, ashy edges soften and the chocolate and coffee notes knit together.

Brew one, leave it alone, and you will understand why Lancashire kept the dark stuff on the bar for three centuries.