01 - Preheat your oven to 350°F. Lightly grease a 12-cup mini muffin tin or tartlet pan with cooking spray or a small amount of coconut oil.
02 - In a medium bowl, whisk together flour, sugar, and salt. Add solid coconut oil and use a pastry cutter or fork to blend until the mixture resembles coarse crumbs. Add cold water, 1 tablespoon at a time, mixing until a dough forms.
03 - Divide dough into 12 equal portions. Press each portion into the bottom and up the sides of each muffin cup to form mini tart shells, ensuring even thickness.
04 - Prick the bottoms of each shell with a fork. Bake for 10-12 minutes until lightly golden. Remove from oven and let cool completely in the pan.
05 - In a saucepan, whisk together lemon juice, lemon zest, coconut milk, sugar, cornstarch, turmeric, salt, and vanilla extract until smooth and no lumps remain.
06 - Place saucepan over medium heat, whisking constantly. Cook for 4-6 minutes until the mixture thickens and just begins to bubble. Remove from heat immediately.
07 - Pour the warm lemon filling evenly into the cooled tart shells. Smooth the tops with the back of a spoon or small offset spatula.
08 - Refrigerate the tarts for at least 1 hour, or until the filling is completely set and firm to the touch.
09 - Garnish with additional lemon zest or fresh berries if desired. Serve chilled. Store leftovers in an airtight container in the refrigerator for up to 3 days.