How Long to Cook Blackened Shrimp (Peeled, 21/25 count) in the cast iron
Specification: 1 lb peeled, deveined 21/25-count shrimp, tossed in melted butter and heavy Cajun spice rub
3-Step Execution Protocol
Heat cast iron skillet over Ripping hot — 500°F+ (260°C+), pan visibly smoking until lightly smoking. Prepare blackened shrimp (peeled, 21/25 count) (1 lb peeled, deveined 21/25-count shrimp, tossed in melted butter and heavy Cajun spice rub).
Cook for 2–3 mins total (60–90 seconds per side). Flip at the 1-minute mark for even browning.
The shrimp curl into a loose C, not a tight O — a tight O means they are already overcooked and about to turn rubbery. Confirm internal temperature reaches 145°F / opaque and curled into a loose "C". Rest for 0 minutes before serving.
USDA FSIS 145°F seafood minimum internal temperature; blackening technique from Paul Prudhomme's Louisiana Kitchen (Morrow, 1984).