Cut the fish into pieces resembling the size of the scallops. Separately toss the seafood with a little oil and season with salt and pepper.
In a saute pan over high heat, sear the fish and scallops, about 30 seconds on each side. The middle should still be raw. Work in batches so you don't overcrowd the pan. Place seafood into a glass dish and coat with lime juice. Glass is best, as it won't react with the acid in the juice. Marinate, refrigerated, overnight.
Remove the flesh from 1/2 a papaya and cut into medium dice. Slice the remaining 1/2 into long strips. Next day, pour off the lime juice and gently fold the drained fish and scallop mixture together with remaining ingredients and diced papaya. Serve with tortilla chips, sliced papaya, and Pink Pickled Onions.
In a small saucepan, bring the vinegar, sugar, and chiles to a boil. Stir until sugar is dissolved. Remove from heat. In a plastic container, place the sliced onions and pour the liquid over them. Place the container in an ice bath to cool. Serve chilled with meats and seafood. These are also great on sandwiches.