Milk + Lemon Juice (Best Option)
1 cup milk + 1 tablespoon lemon juice (let sit 5 minutes)This substitute works because the acid from lemon juice curdles the milk slightly, mimicking the tangy acidity and consistency of buttermilk. The acid helps break down proteins in the meat, tenderizing it and enhancing flavor absorption.
For best results, use whole or 2% milk to approximate buttermilk’s fat content and acidity. Let the mixture sit for 5 minutes to allow curdling before adding to the marinade.
Compared to original buttermilk, this substitute delivers almost identical tenderizing effects and flavor profiles, making it the most reliable replacement in marinades.