Making Cajun Pickled Shrimp is a straightforward process, and following these steps closely will help ensure the best possible flavor and food safety.

Step 1: Prep the Shrimp

Pat the cooked shrimp dry with paper towels to remove excess moisture, then place them into a large, clean glass jar or airtight container. Removing excess moisture helps the shrimp absorb the brine more effectively rather than diluting it.

Step 2: Add the Aromatics

Add the sliced garlic, onion, jalapeño, lemon slices, fresh dill, bay leaves, black peppercorns, mustard seeds, and celery seeds around the shrimp, distributing everything evenly throughout the jar.

Step 3: Build the Brine

In a saucepan, combine the vinegar, water, olive oil, Cajun seasoning, salt, sugar, and crushed red pepper flakes.

Step 4: Heat Gently

Warm the mixture gently over medium heat, stirring until the salt and sugar dissolve completely. Do not let the mixture come to a boil, as this can affect the texture of the oil and dull some of the seasoning’s fresher notes.

Step 5: Cool Slightly

Remove the brine from the heat and allow it to cool for about 10 minutes, until it’s warm but no longer hot. This brief cooling period helps prevent the warm brine from overcooking or toughening the already-cooked shrimp.

Step 6: Pour Over the Shrimp

Pour the warm brine over the shrimp, making sure they are completely covered by the liquid.

Step 7: Seal and Refrigerate

Seal the jar and refrigerate immediately. Let the shrimp marinate for at least 24 hours before serving. For the richest, most developed Cajun flavor, let them marinate for 2 to 3 days.