How to Make It
In a food processor, combine the flour and salt. With the machine on, add the oil and process until the flour is moistened. Sprinkle on the ice water and pulse 5 or 6 times, just until the dough is moistened. Transfer the dough to a work surface and knead just until smooth. Form the dough into 2 disks, wrap in plastic and refrigerate for 30 minutes.
In a large skillet, melt the butter. Add the ground beef and cook over moderately high heat until no pink remains, breaking up the meat with a spoon, about 5 minutes. Add the garlic, onion, bell pepper and bay leaf and cook over moderate heat, stirring occasionally, until the onion is translucent, 7 minutes. Stir in the tomato paste, cayenne, cloves, thyme, coriander and allspice and cook over moderately low heat for 3 minutes. Season with salt and hot sauce and let cool.
Discard the bay leaf. Transfer the filling to a food processor and pulse until chopped.
Preheat the oven to 350° and line a large baking sheet with parchment paper. On a floured work surface, roll out each disk of dough to a 12-inch round. Using a 4-inch biscuit cutter, stamp out 6 rounds from each piece of dough. Brush the edges of the rounds with some of the egg wash and place a rounded tablespoon of filling to one side of each circle. Fold the other half of the dough over the filling and press to seal. Crimp the edges with a fork. Transfer the pies to the baking sheet and brush with the egg wash. Bake for 25 minutes, until golden brown.
In a bowl, combine the mayonnaise, buttermilk, sour cream, celery salt and lemon juice. Season with salt and hot sauce. Transfer to a serving bowl and top with the scallion. Serve the pies with the buttermilk dip.