Enough water should be added to a large stockpot to cover all of the ingredients.
To the water, add the Old Bay seasoning, salt, pepper, and minced garlic. Heat till boiling
Add potatoes and onions after it has boiled. Simmer until just starting to get tender, about 10 minutes.
Cook the corn for a further five minutes after adding it.Cook for five minutes after adding the crab legs.
When the seafood is pink and thoroughly cooked, add the shrimp and crawfish, if using, and simmer for 3 to 4 minutes.
Turn off the heat and use a colander or sieve to remove the seafood boil.
Place the fish on a sizable serving tray or dish together with the potatoes, onions, and corn.
Pour melted butter over the seafood and sprinkle lemon slices and chopped parsley on top.Enjoy while hot!