You need yogurt with live cultures to get started, but once you have yogurt, set some aside to make the next batch and continue the cycle
Storyboard
Three Easy 2-Ingredient Dairy Staples: Yogurt, Buttermilk and Ricotta
Warning: Once you taste these, you will always want to make your own. Luckily these two-ingredient dairy staples are very easy to make yourself.
It takes two minutes to start buttermilk—five if I spill something on the counter and make a mess—and I use ingredients I already have on hand.
Dense, creamy and delicious homemade ricotta surpasses store-bought and requires only two ingredients and about twenty minutes of actual cooking time.