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["To make the pie crust, in a medium bowl, whisk together flour, sugar, and salt. Add the butter and use your fingers to work it into the dry ingredients quickly, until the butter pieces are the size of peas.", "Create a well in the mixture and pour in the buttermilk. Use a fork to bring the dough together. Try to moisten all of the flour bits. On a lightly floured work surface, dump out the dough mixture. It will be moist and shaggy. That's perfect.", "Divide the dough in two and gently knead into two disks. Wrap each disk in plastic wrap and refrigerate for 1 hour.", "To make the filling, in a large saucepan over medium heat, melt the butter. Add the onion and celery and cook for 5 to 10 minutes until they start to soften. Add the garlic, give it a quick stir, and cook for 2 to 3 minutes, being very careful not to let the garlic burn.", "Add the milk and crawfish tails (along with any liquid that came out of the bag). Give a gentle stir, being careful not to over mix the crawfish tails (as you risk breaking them up). Add the parsley, green onions, breadcrumbs, Tony Cachere's or Old Bay seasoning, and salt and peppers to taste; bear in mind that the blend of all four is important to round out the seasoning", "Cook for 5 minutes until the entire mixture is warm. Taste for seasoning and adjust. Keep in mind the seasoning doesn't change while the pie is cooking, so you want to have plenty of flavor at this point. Turn the heat off and cover the mixture while you start on the crust.", "Place a rack in the upper third of the oven and preheat to 375u00b0 F.