Step 1

Stir lemon juice or vinegar into milk and set at room temperature for 10 minutes. Milk will begin to curdle slightly.

Step 2

Whisk milk into yogurt or sour cream until you get the consistency of buttermilk (thick milk). Adjust quantity of milk based on how thick your yogurt or sour cream are. Use immediately.

Step 3

Whisk milk into kefir to thin it out to the consistency of buttermilk. This typically only takes about 1 tablespoon of milk per cup of kefir. Adjust depending on the consistency of kefir. Use immediately.