In a 2 gallon stock pot, heat 1/4 cup olive oil over medium-high heat. Sauté onions, carrots and garlic stirring constantly until light brown, about 10 minutes. Add bay leaves, thyme and parsley and blend into vegetable seasoning. Add live crawfish and cover until crawfish are slightly steamed, about 2 to 5 minutes. Remove lid and add brandy and white wine. Be careful as brandy may flame as it hits the pot. Bring wine to a low simmer and reduce by 1/2 the volume. Add tomato paste, blending well into liquid. Add 3 quarts cold water and bring to a rolling boil. Reduce to simmer and cook stock until nice crawfish flavor is achieved, about 30 minutes. During this process, it is best to pull the heads from the tails of the crawfish to heighten the flavor. Add saffron & season to taste with salt and pepper. Allow stock to continue to simmer until desired rich flavor is achieved. When stock is done, strain and remove 2 quarts. Discard flavoring ingredients and return to stock pot. Return to low simmer and add Herbsaint. Stir well and taste for proper seasoning.
In a sauté pan, heat remaining olive oil over medium-high heat. Season scallops lightly with salt and pepper. When olive oil reaches smoke point, sauté 10 scallops until golden brown around the edges, about 2 minutes on each side. Continue until all scallops are cooked. Remove and keep warm.