⭐ Water + Cream of Tartar (Best Fat-Free Option)
1 cup water + 1 1/2 teaspoons cream of tartar Quick tip: Adds acidity without dairy or fat but lacks creaminess, resulting in a thinner sauce.
Cream of tartar is an acid that can mimic the tanginess of buttermilk when dissolved in water. This acidity helps balance the sweetness in teriyaki sauce.
Because this substitute lacks fat and proteins, it does not provide the creaminess or mouthfeel of buttermilk, so the sauce may be thinner and less rich.
Use this option when avoiding dairy and fats, but expect a less rounded flavor and lighter texture compared to original buttermilk.