Blueberry Tart

Wash blueberries. Preheat the oven to 350°F (175°C). In a large bowl add blueberries, sprinkle with 3/4 cup sugar. Stir in beaten egg. In a small bowl dissolve cornstarch in water and lemon juice. Transfer all to a large saucepan and cook slowly until bubbly and thick. In a medium bowl sift together flour and 2 tablespoons sugar. Cut in butter until well blended then add well beaten egg yolk. Form dough into a ball and chill. Pat evenly into the bottom and up the sides of a 9-inch springform pan. Pour in the berry mixture and bake in a 375°F (190°C) oven for 45 minutes, or until bubbly and crust is done.