A good banger is most of the plate. But the onion gravy is what people remember. The dish is simple — three components, all easy individually — which is why most home versions feel a little flat. The fix is in the gravy.
The sausages
Cumberland, three per plate. Low heat, dry pan with a little oil, never pricked. You want them browned on every face and just cooked through — about 15 minutes.
The mash
Maris Pipers, peeled, simmered until soft. Drain, dry over heat for a moment, then push through a ricer or fine sieve. Beat in warm milk and cold butter — more butter than feels reasonable. Salt to taste. The texture should be smooth enough to pour, but only just.
The gravy
This is where most cooks rush. Slice two big onions thinly and cook them in butter, low and slow, for at least twenty-five minutes — until properly caramelised, deep brown, sweet. Stir in a spoon of plain flour, then a glass of brown ale, then good beef stock. Reduce until it coats the back of a spoon. Whisk in another knob of cold butter to finish for shine.
Plate it tall: mash, sausages on top, gravy poured down the side and over the lot. That is the dish.
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