14.3 Crustaceans & Seafood Cookery

14.3 Crustaceans & Seafood Cookery

Quick Answer: Select shrimp, lobster, and crab for clean smell and sound cold chain, cook crustaceans to a Health Canada minimum of 74°C, stop heat before meat turns rubbery, and run strict allergen controls because crustacean shellfish are a major allergen.

Tasks J-27 and J-28 finish the seafood block with crustaceans—high-value proteins that spoil quickly, overcook easily, and trigger serious allergic reactions when mishandled.

Crustaceans on the Line

Frozen shrimp dominate many kitchens. Thaw under refrigeration or under cold running water in sealed bags per food-safety procedure—not on the counter. Dry thawed shrimp before high-heat sauté so they sear rather than stew. “Dry” versus phosphated wet-pack shrimp behave differently in the pan: wet-pack can shed milky liquid and brown poorly.

Live Lobster & Crab Handling

Live lobsters and crabs should appear lively, with responsive legs or tail. Store live according to supplier guidance—typically refrigerated, moist, and breathing, not drowned in fresh water. Cook live crustaceans as close to service as practical, following humane and house methods (e.g., placing in boiling water, or killing immediately before cooking as trained).

Critical rule: Do not hold dead raw lobster or crab at warm temperatures for later cooking. Once dead, spoilage accelerates and quality collapses. If an animal dies before scheduled cook time, follow house policy—often cook immediately or discard—never leave it on a warm shelf.

Cooked lobster and crab meat is ready-to-eat and must be protected from cross-contamination after cooling. Chill rapidly in shallow pans if not serving hot, label, date, and refrigerate.

Cookery Methods & Doneness

Health Canada’s commonly taught minimum internal temperature for crustaceans is 74°C. Verify with a thermometer in the thickest meat (lobster tail joint meat, crab body/leg meat, thickest shrimp) when the product form allows probing.

Sensory cues that accompany proper cooking:

• Shrimp: Grey translucent raw flesh turns opaque and pink/red; curl into a loose “C.” A tight “O” often means overcooked.
• Lobster: Shell brightens to red; meat turns opaque white; antennae and legs pull more easily when done; check thickest tail meat to 74°C.
• Crab: Shell reddens; meat opaque and pearly; clusters heated through to 74°C.

Overcooked crustacean meat is tough, dry, and stringy. Undercooked meat remains translucent and fails the 74°C safety teaching target. For mixed dishes (pasta, fried rice), add shrimp near the end so carry-over does not push them into rubber.

Shell-on cooking protects moisture and adds flavour to boiling liquid (court bouillon or salted water). Save clean shells for bisque or sauce when HACCP allows—roast shells to deepen flavour before simmering.

Yield, Costing & Portion Control

Shrimp are often sized by count per pound/kilogram (e.g., 16/20, 21/25). Higher counts mean smaller shrimp. Lobster yield from live weight to edible meat is low—shell and organs are heavy—so AP/EP costing must use realistic yields. Picked crab meat grades (lump, backfin, claw) affect price and plate presentation; do not substitute claw for lump in a premium crab cake without recipe and cost adjustment.

Allergen Control (Non-Negotiable)

Crustacean shellfish (shrimp, crab, lobster) are among the major food allergens. Molluscs are also significant allergens in many jurisdictions and kitchen policies. Cross-contact can occur through shared fryer oil, grill surfaces, tongs, cutting boards, prep sinks, and garnish stations.

Professional controls:

1. Separate equipment or deep-clean and sanitize between allergen and allergen-free prep.
2. Label mise en place clearly; never store shrimp stock next to unmarked “fish stock” without identification.
3. Train the line to speak up when a ticket says allergy—do not guess.
4. Communicate with service: if fryer oil cooked breaded shrimp, it is not safe for a crustacean-allergic guest unless a validated allergen program says otherwise.
5. Honest menus: declare crustacean ingredients; do not hide shrimp paste, crab in stuffing, or lobster oil.

Allergen errors are exam-critical and guest-critical. A perfectly cooked lobster is a failure if it contaminates an allergen-free entrée.

Integrating Fin Fish, Molluscs & Crustaceans

Remember the temperature trio taught with Health Canada references for this chapter set:

Plus the bivalve rule: discard shellfish that do not open after cooking.

Keep raw seafood below ready-to-eat foods, separate species when required, and sanitize after raw prep. Seafood cooks fast—mise en place and fire timing matter as much as textbook temperatures.

Common Faults & Exam Scenarios

• Rubbery shrimp: Held in a steam table far past doneness → cook closer to service; verify 74°C without long hot-hold.
• Ammonia smell in “fresh” shrimp: Spoilage → reject; freezing does not fix spoiled aroma.
• Watery sauté: Wet-pack shrimp not dried → pat dry, hotter pan, smaller batches.
• Allergy incident: Shared tongs from shrimp skewer to steak → dedicated utensils and ticket discipline.

Exam Scenario Thinking

Stems may ask for crustacean cook temperature (74°C), how to judge shrimp doneness, what to do with a dead lobster held warm, or how to prevent allergen cross-contact. Answer with temperature, sensory cues, cold-chain urgency for live product, and allergen separation—not with guesswork from shell colour alone.