Shrimp Ceviche Lettuce Wraps

Name: Shrimp Ceviche Lettuce Wraps
Ingredients: 1 pound high-quality medium raw shrimp, peeled, deveined, tail removed, cut into thin pieces; 1 cup freshly squeezed lime juice; 1 cup peeled, seeded and finely chopped cucumber; 1 cup seeded and finely chopped tomato; 1/2 cup chopped fresh cilantro; 1/2 cup finely chopped red onion; 1 serrano chile pepper, deveined, seeded and minced; 1 head of butter lettuce, washed and full leaves pulled off; 1 avocado, sliced; Kosher salt, for seasoning