In a large saute pan over medium heat, melt the butter. Add the onions and peppers. Season with salt and pepper. Saute for 1 minute. Add the crawfish tails and season with salt and pepper. Continue to saute for 2 to 3 minutes. Add the Remoulade. Bring the mixture to a simmer and cook for 1 minute. Keep warm over low heat.
For the tomatoes: Season the tomatoes with salt and pepper. Season the flour, egg wash and breadcrumbs, separately with Creole seasoning. Dredge each slice of tomato in the flour. Dip each slice in the egg wash, letting the excess drip off. Finally, dredge each slice in the breadcrumbs, coating completely. In a large saute pan, over medium heat, add the oil. When the oil is hot, pan-fry the tomatoes, in batches, until golden and crispy on both sides, about 2 to 3 minutes. Remove and drain on paper towels. Season with Creole seasoning. Reheat the crawfish sauce. To serve, lay three tomatoes in the center of each plate. Spoon a quarter of the sauce over each plate of tomatoes. Garnish with green onions.