Gumbo à la Creole

Ingredients

• chopped onion
  1½ cups
• vegetable oil
  3 tablespoons
• flour
  ¼ cup
• fish stock
  5 cups
• x 28-ounce can tomatoes
  1 unit
• dozen or 3 cups shucked oysters (drain; reserve liquid)
  2 unit
• -ounce package frozen sliced okra
  1 10 unit
• salt
  2 teaspoons
• lemon pepper
  2 teaspoons
• ground black pepper
  ¼ teaspoon
• ground red pepper
  ¼ teaspoon
• bouquet garni
  1 unit
• cubed boneless white fish
  ½ pound
• peeled deveined shrimp
  ½ pound
• crab fingers or crab meat
  ½ pound
• gumbo file
  1 tablespoon
• hot cooked rice
  6 cups