To make the filling, in a large bowl mix together the mince, spring onions, chorizo and parsley. Season.
On a lightly floured surface roll the pastry to a thickness of a one pound coin and cut out twelve 9cm circles to fit a 12-hole greased muffin tin. Cut twelve 7cm circles for the lid.
Gently press the large pastry circles into the holes of the muffin tins and half fill with a portion of the mince mixture. Top with a quail egg then a final layer of the mince mixture to cover.
Preheat the oven to 200°C/Fan 180°C/Gas 6. Brush the edges with the beaten egg, then place the lid on top, pressing the edges together to seal. Brush the tops with the remaining egg and make a hole in the centre for any steam to escape.
Bake the pies for 25 minutes, then leave to cool in the tin.
Meanwhile, prepare the relish; heat the oil in a non-stick pan. Cook the onions for 2-3 minutes, or until soft. Add the remaining ingredients and simmer for 5 minutes. Remove from the heat.