01 - Preheat oven to 350°F and lightly grease a 12-cup mini muffin tin or tartlet pan with cooking spray or a small amount of oil.
02 - In a medium bowl, whisk together flour, sugar, and salt. Add solid coconut oil and cut in using a pastry cutter or fork until mixture resembles coarse crumbs. Add cold water 1 tablespoon at a time, mixing until dough holds together when pressed.
03 - Divide dough into 12 equal portions. Press each portion firmly into the bottom and up the sides of each muffin cup to form tart shells.
04 - Prick the bottoms of each crust with a fork. Bake for 10-12 minutes until edges are lightly golden. Remove from oven and let cool completely in pan.
05 - In a medium saucepan, whisk together lemon juice, lemon zest, coconut milk, sugar, cornstarch, turmeric, salt, and vanilla extract until cornstarch is completely dissolved and mixture is smooth.
06 - Place saucepan over medium heat and whisk constantly until mixture thickens and just begins to bubble, about 4-6 minutes. Remove from heat immediately when thickened.
07 - Pour warm lemon filling evenly into cooled tart shells. Smooth tops with the back of a spoon. Refrigerate for at least 1 hour until filling is completely set.
08 - Top with additional lemon zest or fresh berries before serving. Store in refrigerator until ready to serve.