Berry Tart with Ginger Cream

Name: Berry Tart with Ginger Cream
Ingredients: 2 large egg yolks; 4 tablespoons water; 4 (17 1/4-oz) packages frozen puff pastry sheets, thawed but kept chilled; 2 (8-oz) packages cream cheese; 1/2 cup granulated sugar; 1/2 cup chopped crystallized ginger (4 oz); 2 pt strawberries (1 lb), hulled, then halved or quartered if large; 3/4 cup red currant jelly; 4 pt blueberries (2 1/2 lb); Garnish: confectioners sugar; parchment paper and a large flat board (at least 20 inches square) for serving