½ tsp dried sage
½ tsp dried thyme
½ tsp mustard powder
1 free-range egg, beaten
1 sheet (320g) ready-rolled puff pastry
100²µ/3½´Ç³ú black pudding, casing removed, roughly chopped
300²µ/10½´Ç³ú sausagemeat or sausages with skins removed