Blackberry Bars

Ingredients

• 3 cups all-purpose flour (380g)
• 1 cup granulated sugar (200g)
• 1 teaspoon of lemon zest (about 1 medium lemon)
• 1/4 teaspoon salt
• 1 whole egg
• 1 egg yolk
• 1/2 teaspoon vanilla
• 1 cup butter, cold and cut into pieces (2 sticks, 226g)
• 1/3 cup granulated sugar (67g)
• 1 tablespoon + 2 teaspoons cornstarch
• 1/4 teaspoon allspice
• 1/8 teaspoon salt (just a pinch)
• 5 cups fresh blackberries (645g)
• 2 tablespoons lemon juice