Peel and devein raw shrimp
Rinse the shrimp and pat dry
Cut shrimp into small bite-size pieces
Place shrimp in a bowl
Add fresh lime juice to fully cover the shrimp
Refrigerate until the shrimp turns opaque and firm
Drain off excess lime juice
Add diced tomato
Add diced red onion
Add chopped cilantro
Add diced jalapeño if desired
Add salt and black pepper
Add diced cucumber or avocado if desired
Mix gently
Chill before serving
Serve with tostadas, crackers, or tortilla chips