⭐ Milk + Lemon Juice (Best Gluten-Free Option)
1 cup milk + 1 tablespoon lemon juice (let sit 5 minutes)This substitute works because the acid in lemon juice curdles the milk slightly, mimicking the acidity and texture of buttermilk. The acidity is important in teriyaki sauce to balance the sweetness from sugar and mirin, enhancing the overall flavor complexity.
For best results, use whole or 2% milk and allow the mixture to sit for at least 5 minutes before adding to the sauce. Avoid using skim milk as it may not curdle properly and lacks richness.
Compared to original buttermilk, this substitute maintains the sauce’s thin consistency and tangy flavor, preserving the intended balance without introducing dairy heaviness.