1 pound very fresh, firm fish, such as bass, snapper or fluke, skin removed, cut into ½-inch pieces ½ cup fresh lime juice (from 4 juicy limes) 2 medium tomatoes, cut into ½-inch pieces 2 Persian or mini seedless cucumbers, cut into ¼-inch pieces ¼ medium red onion, coarsely chopped and rinsed under cold water 2 jalapeños, seeded and finely chopped ¼ cup chopped cilantro leaves and tender stems Tortilla, plantain or sweet potato chips; tostadas; or Saltines, for serving Add ingredients to...