Peel the shrimp.
12 ounces medium shrimp
Remove the mussels from their shells.
1 pound mussels
Clean the crabs. Crack the claws with a small mallet.
1 pound gumbo crabs
Add the shrimp peels, loose crab parts and mussel shells into a stockpot the water and white vinegar. Bring to a rapid boil.
2 quarts water, 1 tsp white vinegar
Add the crabs and boil for 10 minutes, then remove from the hot liquid to cool.
Remove the crab aprons then use a cleaver to break the crabs in half.
Prepare a chocolate colored roux. 1 cup flour, 1 cup vegetable oil
Add the onions, bell peppers, celery, and garlic. Sauté until tender.
2 cups onion, 1 cup celery, 1 cup bell pepper, 4 cloves garlic
Slowly add the hot stock using a ladle and colander to separate out the shrimp and mussel shells. Stir to incorporate, then bring to a boil.
Reduce to a simmer, then add the thyme, basil, bay leaves, salt, black pepper and cayenne pepper. Simmer for 20 minutes.
4 bay leaves, 1/2 tsp thyme, 1 tsp basil, 1 tsp salt, 1/2 tsp black pepper, 1/4 tsp cayenne pepper
Meanwhile, bring a saucepan up to medium-low heat with 2 tbsp butter and 2 tsp oil.
2 tbsp butter, 2 tsp oil
Sauté the shrimp and mussel meat for 2-3 minutes, then set aside.
Add the crabs to the same pan, and sauté for about 5 minutes more.
Add the shrimp, crabs, the contents of the pan, and the oysters to the stock mixture. Simmer for 15 minutes, then remove from the heat. Let stand for 1 hour to let the flavors meld.
8 ounces oysters
Bring the gumbo back to a low boil, then reduce to a simmer while you make the rice.
2 cups white rice
Add the green onions, then serve in a bowl over hot white rice with a knob of buttered French bread. Add a pinch of gumbo file, and a dash of Tabasco sauce if desired.
1/2 cup green onions, gumbo file powder