Plump shrimp and delicate red snapper adorn this summery corn-and-tomato salad. Serve atop tender lettuce leaves and sprinkle with corn nuts for a satisfying crunch.
Bring 1 1/2 inches water and lime rinds to a boil in a wide pot; season generously with salt. Add corn; boil until bright yellow and crisp-tender, 3 minutes. Transfer corn to a plate. Add shrimp and fish to pot; remove from heat, cover, and let stand until shrimp are opaque and fish is cooked through, 3 to 4 minutes. Transfer to plate; let cool about 5 minutes. Discard lime. Cut corn from cobs.
Stir together corn, tomatoes, jalapeno, onion, cilantro, lime juice, and oil. Remove skin from fish; flake into bite-size pieces and stir into corn mixture with shrimp. Let cool completely, stirring occasionally (or refrigerate, covered, up to 1 day). Season with salt and pepper. Serve seafood salad over lettuce, topped with corn nuts.