Triple Berry Slab Pie

INGREDIENTS

7 1/2 cups

all-purpose flour

1/4 cup

+ 2 tablespoons granulated sugar

1 tsp

kosher salt

1 1/3 cups

unsalted butter, COLD (NOT room temperature), cut into pieces

1 1/3 cups

shortening, COLD (NOT room temperature)

1 1/3 cups

ice water

4 tsp

distilled white vinegar

6 cups

berries (I used blackberries, blueberries and raspberries)

1 cup

granulated sugar

zest of ½ a lemon

juice of ½ a lemon

2 tbsp

all-purpose flour

1/2 tsp

cinnamon