In a large skillet, cook bacon over medium heat until crisp. Remove bacon using a slotted spoon, and let drain on paper towels, reserving drippings in skillet.
Pat crawfish dry with a paper towel. In a large bowl, toss together crawfish, flour, and Cajun seasoning. Add to skillet, and cook over medium heat until crispy. Add green onion, and cook for 1 minute. Remove from skillet, and let drain on paper towels.
Remove core from lettuce, keeping lettuce intact. Rinse and drain. Cut lettuce into 4 wedges. Drizzle with Cajun Buttermilk Dressing, and top with bacon, tomatoes, and crawfish mixture. Serve with parsley and lemon wedges.
Cajun Buttermilk Dressing
In a medium bowl, whisk together all ingredients. Cover and refrigerate for at least 1 hour or up to 2 weeks.
Recipe by Louisiana Cookin' at https://louisianacookin.com/crawfish-wedge-salad/