Cranberry Mince Pie
["2/3 c. sugar", "2 Tbsp. cornstarch", "2/3 c. water", "1 1/2 c. fresh cranberries, rinsed and drained", "pastry for 2-crust pie", "1 (27 oz.) jar mincemeat", "1 egg yolk, mixed with 2 Tbsp. water"]
["Place rack in lowest position in oven.", "Preheat oven to 425\u00b0."]
["sugar", "cornstarch", "water", "fresh cranberries", "pastry", "mincemeat", "egg yolk"]