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Concentrated Lobster Shell Bisque

Bisque concentrata di aragosta

A shell-driven lobster reduction for glazing pasta, finished with cold butter and no cream.

This is not a cream soup. It is a concentrated lobster sauce with enough shell depth, acidity and natural body to cling to fresh pasta. The shell is roasted firmly, the alcohol is reduced in stages, and the finished liquid is strained cleanly before its final reduction.

Approximately 300-350 ml finished bisque · Preparation 20 min · Cooking 1 hr

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Ingredients

Batch

Shell base

  • Prepared 500-600 g lobster, shells and head, presentation shell reserved separately; remaining shell broken into 4-5 cm pieces1
  • Extra-virgin olive oil15 ml
  • Onion or shallot, 5 mm dice60 g
  • Carrot, 5 mm dice40 g
  • Celery, 5 mm dice30 g
  • Garlic, clove, lightly crushed1 each
  • Tomato paste20 g

Liquids and aromatics

  • Cognac20 ml
  • Dry white wine75 ml
  • Good tomato, crushed120 g
  • Light fish or shellfish stock, unsalted or lightly seasoned450 ml
  • Bay leaf1 each
  • Thyme, small sprigs2 each
  • Black peppercorns, lightly crushed4 each

To finish

  • Fine sea saltas required after reduction
  • Cold unsalted butter, cut into small cubes20 g

Method

Kitchen specification

  1. Final yield is 300-350 ml. Do not stop the reduction because a timer has expired; stop it when the sauce coats a spoon in a thin, glossy layer and tastes distinctly of lobster without bitterness.

  2. The stock must be light and only lightly seasoned. A heavily salted stock becomes aggressive as the bisque reduces.

  3. No cream is used. Body comes from the shell extraction, tomato, reduction and the final 20 g cold butter.

  4. Reserve the best presentation shell before starting. Do not break it for the pot and attempt to reconstruct the presentation later.

Roasting the shell

  1. Break the non-presentation shells into 4-5 cm pieces. Pat them dry so they roast rather than steam.

  2. Heat a wide heavy saucepan until hot, add the 15 ml olive oil and then the shell pieces.

  3. Roast the shells firmly for 8-10 minutes, turning them, until they are aromatic, dry-looking and well coloured. Avoid blackening the shell or the fond.

Mirepoix and tomato

  1. Add the 60 g onion or shallot, 40 g carrot and 30 g celery. Cook for 7-8 minutes until softened and beginning to caramelise.

  2. Add the crushed garlic and cook for 30 seconds.

  3. Add the 20 g tomato paste and cook for 2 minutes, stirring constantly, until the paste darkens slightly and loses its raw aroma.

Deglazing and extraction

  1. Add the 20 ml Cognac and reduce until almost dry. Do not leave raw spirit in the sauce.

  2. Add the 75 ml white wine and reduce by approximately 80 percent.

  3. Add the 120 g crushed tomato, 450 ml stock, bay leaf, thyme and peppercorns.

  4. Bring just to a simmer, then lower the heat. Cook gently for 30-40 minutes. The surface should move lazily; a hard boil emulsifies impurities into the liquid and muddies the flavour.

Straining and reduction

  1. Pass first through a chinois. Press the solids only moderately: enough to recover the liquid, not enough to force shell sediment and bitter material through.

  2. For an especially clean restaurant finish, pass the liquid a second time through a very fine sieve or damp muslin.

  3. Return to a clean saucepan and reduce gently until 300-350 ml remains and the sauce begins to coat a spoon.

  4. Taste only now and correct with fine sea salt if required.

Mounting

  1. Remove the pan from direct heat.

  2. Whisk in the 20 g cold butter a few cubes at a time until the bisque is glossy and lightly emulsified.

  3. Do not boil after mounting. Hold warm for immediate service, or chill the unmounted bisque and mount only the quantity needed at the pass.

Chef’s notes

  • The greatest risk is over-extraction. Once the shell has given its flavour, longer cooking does not make the bisque more luxurious; it makes the shell character harder and more bitter.
  • If the finished bisque needs cream to feel rich, the reduction is not yet concentrated enough.
  • For the lobster pasta, use the bisque as a glaze. Start with 120 ml in the pan and add more only if the pasta needs it.

Make ahead

Make the bisque through the strained reduction stage ahead of service. Chill it unmounted. Reheat gently and mount the required quantity with cold butter just before use.

Allergens and diet

Crustaceans. Milk. Sulphites. Celery.

Used in

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Last refined · September 2026