Add 1 tablespoon of apple cider vinegar to the soy milk. Stir the mixture well to combine.
Allow the mixture to sit for about 5-10 minutes. During this time, the vinegar will curdle the soy milk, creating a thick, creamy consistency similar to traditional buttermilk.
Your vegan buttermilk is ready to use immediately! Incorporate it into your favorite recipes, like vegan pancakes, muffins, or dressings.
Notes
Vegan buttermilk can be stored in the refrigerator for up to 3 days. Simply transfer it to an airtight container and give it a good shake before using it again.
You can also make this vegan buttermilk by pouring the apple cider vinegar in the measuring cup first and then adding the soy milk, measuring up the 1 cup line.