Fish should be Orange Roughy, Haddock, or Mackerel, cut into 1 cm cubes. If fresh Cilantro is not available, use 1 tsp dried cilantro leaves. If fresh oregano is not availabel, use quarter tsp dried oregano leaves. Olives should have pimiento stuffing. *Jalapeno Chiles should be seeded and chopped. ~------------------------------------------------------------------------Heat 2 cm of water to boiling in 25 cm skillet; carefully place fish in water. Heat to boiling; reduce heat. Simmer, uncovered, just until fish is opaque, about 30 seconds (DO NOT overcook or fish will fall apart); drain carefully. Mix remaining ingredients except tomato and avocado in a glass or plastic dish. Stir in fish carefully. Cover and refrigerate 2 day, carefully stirring occasionally. Just before serving, gently stir in tomato and avocado; drain. Serve fish mixture on saltine crackers or tortilla chips, if desired.