Soused Shrimp, Red Onion, and Avocado Salad

Sousing, a cooking method whereby seafood is completely immersed and simmered in a highly seasoned pickling liquid, can be traced back to the classical Greek kitchen and was most surely introduced to the South by the first English settlers. To souse, of course, is little more than to marinate, but from Brunswick, Georgia, to Panama City, Florida, to Gulfport, Mississippi, to virtually any other Southern coastal town, when shrimp, scallops, chunks of fish, and other seafood are prepared in t