Source: Mrs Beeton's Book of Household Management (1861)
Poach the cod in its own poaching liquid — the stock builds the sauce as the fish cooks. Bring 300 ml white stock to a gentle simmer in a shallow pan wide enough to lay both slices flat. The stock should barely tremble; a rolling boil toughens the flesh and clouds the liquid you'll need later. Slide the cod in and maintain that low heat for 8–10 minutes, until the flesh is opaque and flakes cleanly at the thickest point. Lift the fish onto a warm plate, removing the centre bone and skin whilst still warm — they come away cleanly at this stage, and trying to do it cold shatters the delicate flesh.
Strain the poaching liquid through muslin into a clean pan, pressing gently to extract all the flavour without pushing debris through. You should have roughly 250 ml. Set over medium heat and add the finely minced ham and shallot. Simmer for 10 minutes; the shallot softens and the ham releases its salt and depth. The stock will reduce slightly and darken — this is intentional stock-making. Now add the cream in a slow stream, stirring constantly. The fat in the cream bonds with the reduced stock, creating sauce-making emulsion. If the colour looks wan or the texture grainy, pass the entire sauce through a fine sieve. This isn't fussiness — it's the difference between a silken velouté and something separated and slack.
Finish with salt to taste, a few drops of garlic vinegar (not a splash — vinegar here sharpens, not dominates), a squeeze of fresh lemon juice, and half a teaspoon of powdered sugar. This balance — acid cutting the cream, sugar rounding the ham's edges — is the dish's architecture. Taste before you're confident; seasoning is always the last move. Arrange the cod on a warm serving dish and pour the sauce over just before serving. The fish cools quickly; don't delay.
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