01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Combine gluten-free flour, almond flour, sugar, lemon zest, sea salt, baking powder, and baking soda in a large bowl.
03 - Add solid coconut oil and mix with a pastry cutter or fork until mixture resembles coarse crumbs.
04 - Whisk together plant-based milk, lemon juice, and vanilla extract in a small bowl.
05 - Pour wet mixture into dry ingredients. Stir until a soft dough forms.
06 - Roll dough into 24 balls (1 tablespoon each). Place on baking sheets and flatten to 1/4-inch thickness.
07 - Bake for 10–12 minutes until edges begin to turn golden. Cool completely on wire racks.
08 - Whisk lemon juice, zest, sugar, and cornstarch in a saucepan. Add coconut milk and turmeric if using.
09 - Cook over medium heat, whisking constantly, until mixture thickens and bubbles, about 4–6 minutes.
10 - Remove from heat. Stir in vegan butter or coconut oil and pinch of salt until smooth. Cool to room temperature.
11 - Spread 1 tablespoon lemon curd on flat side of half the cookies. Top with remaining cookies. Chill 10–15 minutes to set if desired.