Source: Mrs Beeton's Book of Household Management (1861)
Blanch the giblets first. Bring a large pot of water to the boil, submerge the goose or duck giblets for two minutes, then drain and rinse under cold water. This removes the blood and scum that would otherwise cloud the stock and leave a metallic aftertaste. Once cooled slightly, halve the gizzards and leave the livers and hearts whole.
Build your broth from the beef shin, bones, ox-tail, and mutton shanks — the collagen in these cuts will slowly convert to gelatin under heat, giving the soup its characteristic silky mouthfeel. Layer everything into a heavy pot with the blanched giblets, halved onions (unpeeled to deepen colour), carrots, and herb faggot. Pour in 1.4 litres of cold water and bring slowly to a simmer. The first 20 minutes will produce a grey-white scum on the surface; skim this off regularly. Once the liquid clears, reduce to a bare simmering — you want individual bubbles breaking the surface, not a rolling boil. This takes 2.5 to 3 hours. The giblets are done when the gizzards yield immediately to a fork and the broth has taken on a faint amber tone.
Strain through a fine sieve into a clean pot, discarding the bones and aromatics. Return the giblets to the pot. The offal cooks faster than the cartilage-heavy joints, so tasting them at the 90-minute mark prevents them turning grainy. Make a beurre manié by kneading the butter and flour together into a paste, then whisk it into the hot soup in small pieces. This emulsion thickens without flour lumps and adds silkiness. Bring to a gentle boil, stirring often, for 3 to 4 minutes until the raw flour taste disappears and the broth coats the back of a spoon lightly. Stir in the cream — cold cream is easier to incorporate without splitting — and adjust seasoning with salt and pepper. If the broth tastes thin or lacks depth, a teaspoon of mushroom ketchup or a glass of port will strengthen it without overwhelming the delicate gamey notes. Serve in hot bowls.
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