Place a rack in the bottom of a large shallow roasting pan or fish poacher. Add 1 1/2 quarts water and next 9 ingredients. Place pan over 2 surface units on stove top; bring mixture to a boil. Reduce heat; cover and simmer 30 minutes.
Add redfish; cover and cook over medium heat 10 minutes per inch of thickness of fish. Remove fish to a warm serving platter. Serve immediately or refrigerate, and serve chilled.