Briefly blitz the pigeon and chicken in a food processor. Mix with the veal, peppercorns, anchovy fillets, mustard, juniper berries, sage, soured cream and seasoning.
To make the pastry, sift the flour and salt into a bowl and make a well. In a saucepan, gently melt the butter with the water and pour into the flour. Stir until evenly mixed, add the egg and continue mixing vigorously unt