Biersoße

Biersoße is a German beer sauce made by combining a browned meat fond or strong stock with beer, onions and often root vegetables. It is generally served hot with roast pork, Schweinshaxe (pork knuckle), sausages or dumplings. The sauce may be thickened with a small roux, reduced until naturally concentrated, or finished with a little cornflour. It should coat the food without becoming the sort of paste that could be used to repair masonry.

The term is broad rather than a single codified recipe. A sauce made with dark beer and pork drippings will be sweet, roasted and malty; one made with a pale lager will be lighter, sharper and more obviously bitter. Regional practice varies across Germany, Austria and neighbouring central Europe, as described in German and central European gravies.

Flavour and regional character¶

The most familiar Biersoße is a brown sauce for roast pork. Onions are browned in pork fat, the roasting tin is deglazed with beer, and the liquid is enriched with pork juices or stock. Dark lager, Märzen, Dunkel or maltier regional beers add toasted grain and caramel notes. Some cooks use a small amount of wheat beer, though its yeastiness and acidity make the result less conventionally brown and savoury.

Pale lager, pilsner and Kölsch-style beers can also be used. They give a thinner-coloured sauce with a more pronounced hop bitterness, which works best with restrained seasoning and a clean stock. Strongly hopped modern beers are usually unsuitable: boiling concentrates their bitterness rather than making it disappear.

Common aromatics include onion, carrot, celery root, garlic, bay leaf, caraway and marjoram. Juniper, allspice and black pepper appear in some versions, particularly with pork and game. Mustard may be stirred in at the end, although that makes the sauce a mustard-and-beer variation rather than a neutral Biersoße. See Mustard in gravy for the effect of adding it.

Ingredients and proportions¶

A beer with moderate bitterness is preferable. Dark beer need not be sweet, but a very bitter stout or heavily hopped IPA can dominate the stock. The alcohol does not need to be separately removed: simmering for 20–30 minutes reduces it substantially, though not necessarily completely.

Traditional method¶

Serves 4 · About 50 minutes

You need

• 2 tbsp pork fat, dripping or neutral oil
• 1 large onion, finely sliced
• 1 small carrot and 100 g celery root, diced
• 1 tbsp plain flour
• 330 ml dark lager or malty brown beer
• 500 ml strong stock, pork stock or vegetable stock
• 1 bay leaf
• ½ tsp dried marjoram
• ½ tsp caraway seeds, optional
• Salt and freshly ground black pepper
• 1 tsp cold cornflour mixed with 1 tbsp water, if required

Method

1. Heat the fat in a heavy saucepan. Add the onion, carrot and celery root and cook over medium heat for 10–12 minutes, stirring often, until deeply golden but not burnt. This stage supplies much of the sauce's colour.
2. Sprinkle in the flour and cook for 2 minutes, stirring continuously. This makes a light roux and removes the raw flour taste.
3. Pour in the beer gradually, scraping the base of the pan. Allow it to bubble for 3–4 minutes, then add the stock, bay, marjoram and caraway.
4. Bring to a gentle simmer and cook uncovered for 25–30 minutes. The liquid should reduce by roughly one quarter and smell rounded rather than sharply alcoholic.
5. Remove the bay leaf. Blend the vegetables for a smooth sauce, or strain them out for a clearer finish. For a coarse, rustic texture, leave them in and whisk thoroughly.
6. Taste before salting, particularly if the stock contains a cube or concentrated seasoning. If the sauce remains thin, whisk in the cornflour slurry and simmer for 1–2 minutes. Do not add dry cornflour directly to hot liquid.

When pan juices are available, the sauce is best made in the roasting tin. Remove excess fat, retain the browned deposits, and deglaze with the beer before adding stock. This is the same principle as Deglazing a roasting tin, but the beer brings more malt and bitterness than water or wine.

Thickening and finishing¶

A roux gives Biersoße a stable, opaque texture and is suitable when the sauce must stand in a serving dish. It should be cooked before the beer is added, otherwise the flour can taste raw and form lumps. A sauce made without flour can be reduced until the stock, gelatin and dissolved vegetables provide sufficient body. Why flour thickens liquid explains the starch mechanism in more detail.

Cornflour produces a glossier, more transparent sauce and is useful when the beer and stock have already been reduced. Add it only at the end and simmer briefly; prolonged boiling can weaken the set. For a particularly rich version, whisk in a small knob of cold butter off the heat. This is a finishing emulsion, not a substitute for balanced seasoning; Emulsification in gravy covers the distinction.

A spoonful of mustard, a dash of Worcestershire sauce or a few drops of cider vinegar can correct a sauce that tastes flat. Sweet additions such as apple syrup or redcurrant jelly are used in some modern versions, but should remain restrained. The sauce is meant to taste of beer, stock and browned meat, not pudding.

What to serve with it¶

Biersoße is most closely associated with roast pork, crackling and pork knuckle. It also suits bratwurst, grilled sausages and meatloaf, particularly when served with mash or boiled potatoes. In southern German and Austrian settings it is commonly spooned over bread dumplings or potato dumplings, which absorb a considerable quantity of sauce without complaint.

For roast pork, use the meat's own drippings and a stock made from appropriate bones only when those bones are intended for human cooking; the similarly named page concerns a different use and should not be treated as a recipe. For a meat-free version, use browned mushrooms, onion and a concentrated vegetable stock, following the principles of Vegetarian gravy.

Biersoße keeps for up to three days in the refrigerator and freezes well before any cream or butter is added. Reheat it gently, loosening with stock or water, and correct the seasoning after reheating. A thick skin or separated fat can be whisked back in, or removed with a spoon according to preference.