
Blanch seafood in plenty of boiling salted water for 2 minutes, then drain and plunge into ice water to stop cooking.
Cut squid (if using) into bite-size pieces.
In a glass or ceramic bowl, mix seafood, lime juice, onion, garlic, salt and pepper. Refrigerate 30 minutes.
Add cilantro, ketchup, jalapeños and jicama (if using) and mix. Refrigerate at least 1 hour, or up to 6 hours.
Serve in chilled glasses, topped with avocado slices. At the table, pass tortillas, lime wedges, and hot sauce.
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