Pastry Cream: In a heavy medium saucepan, combine tea bags, 1.75 cups milk, and sugar. Bring to boiling, stirring to dissolve sugar. Remove from heat, cover and set aside. In a small mixing bowl, gradually stir quarter c milk into cornstarch to form a smooth paste. Add egg. Beat at medium speed until b lended. Add egg yolks, one at a time, beating well after each addition. Remove tea bags from milk mixture, squeezing out as much milk as possible. Gradually beat hot milk mixture into egg mixture at low speed. Pour into a clean saucepan. Cook, whisking constantly, over medium-low heat until mixture becomes extrememly thick and boils. Pour into a large bowl. Add 4 tb butter and vanilla. Beat at medium speed until smooth. Pless plastic wrap directly on surface of pastry cream. Cool to room temperature, about 1 hour. Refrigerate until thoroughly chilled, about 2 hours. Pate Brisee: While pastry cream is cooling, in a food provcessor combine flours, salt, baking powder, and half c butter. Pulse with quick on/off pulses until mixture resembles peas. With processor running, gradually add ice water until dough cleans sides of bowl and forms a ball. Shape dough into a disc shape. Wrap and refrigerate at least 30 minutes. On a lightly floured surface, roll pastry into a 30 cm circle. Fit into a 9: pie plate. Roll edge under and flute. Prick dough all over with tines of fork. Cover and refrigerate for 30 minutes. Preheat oven to 425�F. Line pastry with double thickness of foil. Fill with dried beans. Bake at 425�F for 15 minutes. Remove foil and beans. Continue baking pastry shell 5-10 minutes until lightly browned. Cool on rack. Cream Topping: Beat cream until it just begins to hold its shapeGradually add 1 tb sugar and half tb tea., beating to stiff peaks. Cover and refrigerate. Filling: Stir pureed banana into chilled pastry cream until blended. Fold in half c cream topping, then sliced bananas. To Assemble: Mound banana cream filling into cooled pie shell. Spread with remaining cream topping. Cover and refrigerate at least 2 hours.