Just before removing from heat, stir in leeks and spring onion and allow to soften for 2-3 minutes.
Remove from heat, adjust seasoning, cover and allow to cool before refrigerating for a full day.
For the dough, combine the flour and salt and on a clean dry surface form a volcano with the mixture.
Add the lard or beef fat to the centre and incorporate into the flour, slowly adding water as needed until the dough is smooth and uniform. Wrap the dough in cling film and refrigerate for 3 hours.
Remove dough from the refrigerator and knead, making sure to rotate the mass four or five times. Wrap the dough again and return to refrigerator for a half hour more.
On a floured surface, roll out the dough to a thickness of 4 mm (about inch).
Cut discs with an 8-cm (3-inch) pastry cutter and set aside for use.
Using a tablespoon, place the meat in the centre of the disc, fold in half and crimp the edges. Everyone has their own technique for this last step, but I stick with what my grandfather taught me: after folding, simply use the tines of a fork to crimp around the edge.
In a heavy pot, fry the empanadas in ample hot oil until the bottom sides are golden, then carefully turn them until the other sides are the same colour. Remove with a slotted spoon and place on absorbent paper. Serve them very hot.
Notes
Our empanadas contain about 85 g (3 oz) of filling and are fried. Empanadas are a very emblematic national dish, and each province has its own way of making and cooking them, just as it is with asado.
Recipe by Honest Cooking at https://honestcooking.com/chefs-collective-la-cabreras-beef-empanadas/