In a small bowl, mix mayonnaise, horseradish sauce, garlic powder, smoked paprika, and Cajun Seasoning until well blended.
Toss Shimp with lemon juice and Cajun Seasoning
Add water to the inner pot. Place the seasoned shrimp in a steamer basket and place the basket in the pot.
Secure the lid and cook on high pressure for 0 minutes if using fresh shrimp or 1 minute if using frozen. Quick Release Pressure. Remove the Lid
Spread 2 tablespoons of remoulade sauce on each bun. Add shrimp, pickles, and lettuce, and serve.