Cook butter and sugar in a large saucepan for 1 min, then add in all ingredients.
Place over a low heat and cook, stirring occasionally for approx. 10 mins or until most of the liquid has evaporated but not dry, set aside to cool.
Roll out a pastry dough to about 3 mm thick using a 10 cm round cutter to stamp out several pieces of bases & lids circles, carefully mould into a muffin mould.
Divide the mincemeat between the pastry cases, filling each 1/3 full.
Brush the edges of the pastry bases with water, lay pastry lid on top and press the edges together to seal. Brush each pie with egg.