Step 1: Make the Lemon Curd In a small saucepan, whisk together sugar, cornstarch, salt, and turmeric. Gradually whisk in water and lemon juice until smooth. Cook over medium heat, whisking constantly, until thickened and bubbling (5-7 minutes). Remove from heat and stir in lemon zest and vegan butter. Set aside to cool slightly.
Step 2: Prepare for Baking Preheat oven to 350°F (175°C). Line two baking sheets with parchment paper.
Step 3: Make the Cookie Dough In a large bowl, beat vegan butter and powdered sugar with an electric mixer until light and fluffy. Beat in vanilla extract. In a separate bowl, whisk flour and salt. Gradually add flour mixture to butter mixture on low speed until just combined. Do not overmix.
Step 4: Shape the Cookies Roll dough into 1-inch balls and place 2 inches apart on prepared baking sheets. Use thumb or 1/2 tsp measuring spoon to make an indentation in the center of each ball.
Step 5: Fill and Bake Fill each indentation with about 1/2 teaspoon of prepared lemon curd. Bake for 12-15 minutes, until edges are lightly golden.
Step 6: Cool Let cookies cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.
Notes
Use freshly squeezed lemon juice for the best flavor. Dough can be made ahead and refrigerated for up to 3 days; let sit at room temperature a few minutes before rolling. Optional: dust cooled cookies with powdered sugar for a finishing touch. Can also be adapted into vegan lemon bars with shortbread crust.