01 - Combine diced mangoes and lemon juice in a blender or food processor. Blend until completely smooth, about 1-2 minutes. For extra silky texture, strain through a fine-mesh sieve.
02 - In a medium saucepan, whisk together granulated sugar and cornstarch until evenly distributed and no clumps remain.
03 - Pour mango purée and coconut milk into the saucepan with the sugar mixture. Whisk vigorously until completely smooth and incorporated.
04 - Set saucepan over medium heat. Cook while whisking constantly until mixture begins to bubble and thicken noticeably, approximately 5-8 minutes. The curd is ready when it coats the back of a spoon.
05 - Remove saucepan from heat immediately. Stir in vanilla extract and turmeric if using for enhanced golden color.
06 - Transfer curd to a clean glass jar or bowl. Allow to reach room temperature uncovered, then refrigerate for at least 2 hours until fully set and chilled.
07 - Serve chilled as a spread for toast, swirl into yogurt, or use as a filling for cakes and pastries.