Comment by jivardo_nucci

Very easy recipe (takes about an hour, mostly waiting for milk to cool):

- Buy a container of your favorite _plain_ yogurt and a gallon of milk,

- Boil the milk in a pan,

- Cool milk until it is warm (usual baby formula test - you can drop it on your forearm w/o hurt),

- Add the plain yogurt and stir well,

- Cover pan and put in a warm place, e.g., inside your unlit gas oven (pilot light should be running) and forget about it for 8-12 hours,

It will become thick tasty yogurt. Save some for the next batch.