Indulge in the creation of individual mince pies, a delightful process that begins with lining muffin pans using 3-inch rounds of pastry dough. Take care to fill each pastry round with the delectable mincemeat mixture, ensuring a generous portion in each. To seal the pies, gently moisten the edges with either cold water or a brush of white of egg. Cover the filled pies with another round of pastry, pressing the edges together to create a secure seal. For an exquisite touch, create a small hole in the top of each pie, allowing the steam to escape during baking. Enhance the visual appeal by delicately brushing the pastry tops with white of egg and sprinkling a touch of sugar. Allow the pies to bake in a preheated 450°F oven for approximately 20 minutes, or until they have risen beautifully and acquired a desirable golden-brown hue. Relish in the joy of freshly baked mince pies, their tempting aroma filling the air as they await to be savored during the holiday season.