1Combine milk, lemon juice, sugar, and corn starch in a pot. Whisk until smooth.
2Bring the mixture to a boil while continuously whisking.
3Remove from heat and stir in the butter until fully incorporated.
4Add a pinch of turmeric for color.
5Transfer the lemon curd to a bowl, cover the surface with plastic wrap, and chill completely (1-2 hours).
6Blend the chilled lemon curd in a food processor until smooth. Add 1-2 tablespoons of any liquid (water, lemon juice, or cream) to adjust the consistency if needed.
7Store in an airtight container in the refrigerator for up to 3-4 days.