Rocky Point Ceviche

Name: Rocky Point Ceviche
Ingredients: To 'cook' the shellfish; 1 pound shrimp, scallop or firm white fish chopped into 1/2 pieces (you can do a combo of shellfish, but I wouldn't mix shellfish with fish); 1 cup lime juice + zest from the limes; For the sauce; 1/2 cup ketchup; 1-4 tablespoons hot sauce (something vinegary, not tabasco style); 2 tablespoons olive oil; 1/3 cup cilantro, finely chopped; 1/2 cup onion, finely diced; 1/2 cup cucumber, finely diced; 1/2 cup jicama, finely diced; 2-3 tablespoons lime juice; salt; 1 avocado, diced; a couple of sprigs of green onion for garnish; big bowl of corn tortilla chips