Place fish in freezer.
Juice the limes and strain to remove the pulp and seeds.
Add garlic, soda pop, ½ the cilantro and tomatoes (with all juice) and seasonings.
Put all into a bowl, mix and let sit for 10 + minutes.
Removing fish from freezer cut into cubes.
Now add fish/shellfish to bowl and mix so all the cooking ingredients have covered the fish.
Cover tightly and put in refrigerator.
Toss and turn about every ½ hour until fish is cooked (usually about 3 hours total time before its cooked) then add remaining ingredients of tomatoes, onions etc.
Once fish is cooked, remove, strain lime juice.
Cut avocado/mango into 3/4″ cubes and mix with fish or use as boats
Serve with corn tortilla chips or saltine crackers, Enjoy!