Anna Olson's Pecan Butter Tarts

Ingredients

• 2 ¼ cup cake and pastry flour
• 2 Tbsp sugar
• ¾ tsp salt
• 1 cup cold unsalted butter, cut into pieces
• 6 Tbsp cold water
• 1 Tbsp lemon juice or white vinegar
• ½ cup unsalted butter
• 1 cup packed dark brown or demerara sugar
• 2 large eggs
• ½ cup maple syrup
• 1 Tbsp lemon juice
• 1 tsp vanilla extract
• ¼ tsp salt
• ½ cup lightly toasted pecan pieces