Shrimp and Avocado Ceviche in Endive

fresh shrimp, jumbo size, peeled and deveined

fresh lime juice

large tomato, chopped

or 2 jalapenos, seeded and minced

scallions, chopped, white and light green parts only

cilantro leaves, chopped

kosher salt

cracked black pepper

ripe avocado, chopped

Half a lime

heads endive, leaves separated