In a bowl, combine lemon juice with almond milk to make “vegan buttermilk.” Set aside for a few minutes — it should curdle slightly. It won’t thicken like buttermilk, but it has a similar effect in recipes.
Use in vegan ranch, biscuits (or gluten-free biscuits), or anywhere else that calls for buttermilk. Best when fresh, but it can be stored in the refrigerator for up to 1-2 days and stirred before using.