Triple berry slab pie combines, blackberries, raspberries and blueberries in a tender pastry crust set in a large jelly roll baking pan. It's a great dessert for a crowd.
48ouncesfrozen berries such as triple berry blend10 cups berries
OR fresh berries below:
4cupsblackberries
3cupsraspberries
2cupsblueberries
2Tablespoonsfresh lemon juice
1Tablespoonlemon zest
¾cupsugar
½cupbrown sugar
½cupflour
½teaspoonsalt
2Tablespoonsbutter
For Egg Wash/Finish
1egg
1Tablespoonwater
1Tablespoonsugar
Instructions
Hand Method
Put flour, sugar and salt in a bowl. Mix to combine. With a pastry cutter, cut in butter and shortening into flour mixture until it resembles coarse meal.
Stir in ice water one tablespoon at a time, tossing with fork after each addition. You may not need all water—stop adding water when mixture clumps together.
Divide dough into three equal parts. Shape ⅓ of dough into a flat disc. Shape ⅔ of dough into a second larger flat disc. Cover with plastic wrap and refrigerate for at least 30 minutes.
Food Processor Method (alternate method)
Place flour, sugar and salt in bowl of food processor and pulse to combine.
Add cold butter (cut into small cubes) and shortening (cut into cubes) and pulse to cut fat into flour mixture (about 10 times).
Add water, 1 tablespoon at a time and pulse each time until mixture clumps together.
Divide dough into three equal parts. Shape ⅓ of dough into a flat disc. Shape ⅔ of dough into a second larger flat disc. Cover with plastic wrap and refrigerate for at least 30 minutes.
Triple Berry Slab Pie Filling and Assembling
Pre heat oven to 375 degrees Fahrenheit. Separate larger pastry disk into 2. Roll each piece of dough on lightly floured surface to about 7x9-inch rectangle.
Lift dough by wrapping it gently around rolling pin and place on half side of 10 x 15 inch jelly roll pan. Continue with second pieces. Press seams of dough together in middle of pan. Turn edges of dough under and crimp, or you can simply trim edges off at top of pan.
Roll out smaller pastry disk to ¼ inch thickness on lightly floured surface. Cut out flower shaped pieces of dough with cookie cutters (or other shape). Refrigerate pieces until ready to use.
Place berries in a large bowl. Add lemon juice and zest. Stir to combine. Place both sugars, flour and salt in a bowl. Stir to combine, then sprinkle over berry mixture and gently stir.
Spoon berry mixture into pan with pie crust. Dot with small cubes of butter.
Egg Wash/Finish
Beat egg and 1 Tablespoon water together. Arrange flower cut outs over top of berry filling in crust. Brush egg mixture over flower cutouts. Sprinkle cutouts with sugar.
Bake at 375 degrees for 50 minutes or until pastry flowers are lightly golden brown. Cool before serving.