For Tart Shell: Combine flour, corn starch, sugar and salt in medium bowl. Cut in butter using pastry blender or two knives until coarse crumbs form. Combine yolk and 2 tablespoons ice water; stir into flour mixture. Add enough remaining water, 1 teaspoon at a time until dough is moistened and can be formed into a ball.
Roll dough to a 12-inch circle on a lightly floured surface. Fit pastry into a 10 x 1–inch tart pan (OR a 9 or 9-1/2 inch pie plate), pressing into side of pan. Trim excess crust as needed (or flute edges if using pie plate). Prick bottom of crust with a fork. Place in freezer 30 minutes.
Bake in preheated 400°F oven 13 to 15 minutes. Cool completely on wire rack.
For Custard Filling: Whisk sugar, corn starch and salt in a small saucepan. Stir in half & half gradually until smooth, then egg yolk. Bring to boil over medium heat, stirring constantly; boil 1 minute. Remove from heat; stir in vanilla and liqueur, if desired. Pour into bowl; cover surface with plastic wrap. Chill 1 hour.
To Assemble Tart: Spread custard on bottom of baked tart shell. Arrange berries on custard. Prepare glaze by combining melted jelly with liqueur. Brush fruit with jelly mixture. Chill 1 hour or until ready to serve.