01 - Preheat oven to 350°F. Lightly grease a 12-cup mini muffin tin or tartlet pan.
02 - In a medium bowl, mix flour, sugar, and salt. Add solid coconut oil and use a pastry cutter or fork to blend until mixture resembles coarse crumbs. Add cold water, 1 tablespoon at a time, and mix until dough forms.
03 - Divide dough into 12 portions. Press each portion into the bottom and up the sides of each cup in the muffin tin to form mini tart shells.
04 - Prick the bottoms with a fork. Bake for 10-12 minutes until lightly golden. Remove and let cool.
05 - In a saucepan, whisk together lemon juice, lemon zest, coconut milk, sugar, cornstarch, turmeric if using, salt, and vanilla extract until smooth.
06 - Cook over medium heat, whisking constantly, until mixture thickens and just starts to bubble, about 4-6 minutes. Remove from heat.
07 - Pour warm lemon filling evenly into cooled tart shells. Smooth tops with a spoon.
08 - Chill tarts in refrigerator for at least 1 hour, or until set.
09 - Garnish with extra lemon zest or fresh berries before serving, if desired.