01 - Whisk together lemon juice, lemon zest, sugar, cornstarch, coconut cream, turmeric, and salt in a small saucepan until smooth. Place over medium heat and cook, whisking constantly, until mixture thickens and just begins to bubble, approximately 3-4 minutes. Remove from heat, transfer to a bowl, and let cool completely before refrigerating to thicken further.
02 - Beat coconut oil and sugar in a large mixing bowl until light and creamy. Add applesauce, lemon zest, lemon juice, and vanilla extract, mixing until combined. In a separate bowl, whisk together gluten-free flour, almond flour, cornstarch, salt, and baking soda. Gradually add dry ingredients to wet ingredients, mixing until a soft dough forms. Divide dough in half, shape into discs, wrap in parchment paper, and chill for 30 minutes.
03 - Preheat oven to 350°F and line two baking sheets with parchment paper. On a lightly floured surface, roll dough to 1/4-inch thickness and cut into 2-inch rounds. Place cookies on prepared baking sheets, spacing 1 inch apart. Bake for 10-12 minutes until edges are just golden. Cool completely on wire racks before filling.
04 - Spread 1-2 teaspoons of cooled vegan lemon curd onto the flat side of half the cookies. Top with remaining cookies to form sandwiches. Dust with powdered sugar if desired and serve immediately or refrigerate.