Start by combining the sugar and cornstarch in a small saucepan. Whisk thoroughly to eliminate any lumps and ensure the mixture is well incorporated.

Pour in the plant-based milk, followed by the lemon juice, lemon zest, and turmeric, if you're using it for added color. Stir everything together until smooth.

Set the pot over medium heat. Continue whisking regularly as the mixture begins to warm up. After a few minutes, you'll notice it gradually thickening—this usually takes around 5 minutes. As the curd thickens, whisk more vigorously to prevent any clumps and to achieve a silky, uniform texture.

Once it reaches your desired consistency, remove the pan from the heat and carefully transfer the lemon curd into a heatproof container or jar.

You can enjoy it warm, or allow it to cool completely before refrigerating. Store it in the fridge for up to one week. The curd will continue to thicken slightly as it chills.