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1
Build a dark roux in a heavy pot over medium heat, cooking flour and fat together — stirring constantly — until the roux reaches the chocolate stage: deep brown, nearly black, smelling of toasted nuts and dark bread. This is the same roux as gumbo. A medium roux is insufficient; the colour and depth of the finished soup depend entirely on the roux reaching full darkness. The roux is done when it is nearly black and the raw-flour smell has entirely disappeared.
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2
Add the trinity — onion, celery, and green bell pepper — directly to the dark roux and cook, stirring, until the vegetables have softened and begun to melt into the roux. The mixture will seize momentarily; continue stirring. Done when the vegetables are fully softened and the roux has absorbed them.
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3
Add the ground turtle meat and cook, breaking it up thoroughly, until it has lost its raw colour and begins to dissolve into the base. The ground meat goes in early so that it breaks down over the long cook and gives body to the soup rather than remaining as discrete pieces. Done when no raw meat is visible.
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4
Add the tomato, beef stock, Worcestershire sauce, allspice, and clove. Stir to incorporate. Bring to a gentle simmer. Add the cubed turtle meat now, so that it will be cooked through but retain identifiable pieces. Simmer gently for 1 to 2 hours, until the cubed turtle is fully tender — lean, dense turtle meat requires sustained gentle heat to yield. Done when a piece of cubed turtle yields without resistance under light pressure.
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5
Add the dry sherry to the pot during the final stage of simmering and allow it to cook in, integrating its oxidised, nutty character into the broth. The soup should reduce to a consistency that coats a spoon heavily. Done when the spoon holds a thick, nearly black coat and the sherry aroma is present but integrated rather than raw.
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6
Stir in the finely chopped hard-boiled egg just before service. The egg must be chopped fine — a true dice — so that it distributes evenly through every spoonful and provides a creamy, protein-rich texture against the dense soup. Done when the egg is fully incorporated and no large pieces remain.
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7
Ladle into small bowls — this is a first-course portion, not a bowl-meal. Float lemon wheels on the surface. Present a small cruet of dry sherry tableside; each guest adds their own. Done when the lemon wheels are in place and the sherry is to hand — the sherry perfumes the bowl with each spoonful.