01 - Combine diced mangoes and lemon juice in a blender or food processor. Process until completely smooth, stopping to scrape down sides as needed.
02 - Whisk together granulated sugar and cornstarch in a medium saucepan until evenly combined, ensuring no cornstarch clumps remain.
03 - Pour mango purée and coconut milk into the saucepan with the sugar mixture. Whisk thoroughly until the mixture is uniform and lump-free.
04 - Set saucepan over medium heat. Cook while whisking continuously until the mixture begins to thicken and bubble, approximately 5–8 minutes. The curd is ready when it coats the back of a spoon.
05 - Remove from heat immediately. Stir in vanilla extract and turmeric (if using) until fully incorporated.
06 - Transfer curd to a clean jar or bowl. Allow to cool to room temperature, then refrigerate for at least 2 hours to achieve proper consistency.
07 - Serve chilled as a spread on toast, swirled into yogurt, or layered in desserts.