How to Make It
Preheat the oven to 450°. Heat the oil in a 9- to 10-inch cast-iron skillet. Add the celery and onion and cook over low heat, stirring occasionally, until softened, about 8 minutes. Add the ground beef and cook over moderately high heat, breaking it up with a wooden spoon, until no pink remains, about 5 minutes. Add the paprika and cook, stirring, until fragrant, about 1 minute. Stir in the tomato soup, water and tomato paste until thoroughly blended. Season with salt and pepper and remove from the heat.
In a large bowl, mix the flour with the baking powder, 1 teaspoon of salt and the celery seeds. Using a fork, cut in the shortening until the mixture resembles small peas. Gently stir in the milk just until a soft dough forms.
Using 2 spoons, arrange tablespoon-size dollops of the dough all over the beef filling to within 1 inch of the edge of the skillet. Bake the beef pie for 20 minutes, or until the crust is browned and cooked through and the filling is bubbling. Let the pie stand for 10 minutes before serving. Invert onto a large, flat plate or serve straight out of the skillet.