In a large bowl, mix the flour and salt together. Cut the butter into the flour mix until the mixture resembles coarse crumbs.
Gradually add cold water to the flour mixture, mixing just until it forms a dough. Wrap in plastic and refrigerate for 30 minutes.
In a pan over medium heat, cook the ground beef until it's browned. Add the onion, garlic, cumin, and paprika and cook until the onions are soft.
Roll out the dough on a floured surface and cut into circles. Place a spoonful of the beef mixture in the center of each circle.
Fold the circles in half over the filling and seal the edges with a fork.
Heat the vegetable oil in a large skillet over medium heat. Fry the empanadas until golden brown on each side.
Remove and drain on paper towels. Serve warm.