Milk + Lemon Juice (Best Option)
1 cup milk + 1 tablespoon lemon juice (let sit 5 minutes)This substitute works because the acid in lemon juice slightly curdles the milk proteins, mimicking the tangy acidity and texture of buttermilk. The acidity helps break down rice starches, contributing to the creamy texture essential in risotto.
For best results, use whole milk for richness and allow the mixture to sit for at least 5 minutes to curdle properly before adding to the risotto. Avoid overheating immediately to prevent separation.
Compared to buttermilk, this substitute yields a very similar texture and flavor profile, preserving the risotto's characteristic creaminess and subtle tang without overpowering the dish.