Melt butter in a heavy bottom pot
Add flour and cook on moderate heat, stirring continuously until the color resembles peanut butter. This will take 5 - 10 minutes.
Add bell pepper, jalapeno, celery and onion. Cook for a few more minutes.
Add the stock and whisk to incorporate the roux.
Add thyme, Worcestershire sauce, hot sauce and bay leaves.
Cook for 10-15 minutes and season with Cajun spice, salt and pepper.
Add crawfish meat and crab meat to the simmering stew and stir until just heated through.
Adjust seasoning with salt and pepper to taste.