01 -
Bring a large pot of water to boil. Add Old Bay seasoning and lemon slices. Cook shrimp for 2-3 minutes until pink and opaque. Transfer to ice bath to stop cooking, then drain.
02 -
Whisk together vinegar, olive oil, lemon juice, Dijon mustard, and salt in a large bowl. Stir in garlic, red onion, pepper flakes, peppercorns, bay leaf, parsley, and optional capers.
03 -
Add cooked shrimp to marinade and toss to coat evenly. Transfer to a glass container, ensuring shrimp are fully submerged. Cover and refrigerate for at least 4 hours or overnight, stirring occasionally.
04 -
Serve chilled as an appetizer with crackers, on a salad, or as part of a seafood platter.