Cook Shrimp: If using raw shrimp, cook in lightly salted boiling water until pink and opaque. Cool, peel, and devein.
Chop the Veggies: Carefully chop the red onion, radishes, celery, bell pepper, and jalapeño (if included) into small, even pieces.
Mix Mayo: Combine mayonnaise, chopped cilantro, and crushed garlic in a bowl to create the cilantro mayonnaise if not already prepared.
Add Lime Juice: Stir in lime juice and adjust salt to taste.
Combine Ingredients: In a large mixing bowl, combine the shrimp, diced vegetables, and hard-boiled eggs.
Add Dressing: Gently fold in the cilantro lime mayonnaise, ensuring everything is evenly coated.
Refrigerate: Chill the salad for 15-20 minutes to let the flavors meld.
Serve: Serve cold as a standalone dish, with crackers, or as a taco filling.