Greek Yogurt for $1.10 a kilo!

I have experimented with making yogurt quite a few times but have usually been disappointed with the result. We do use a lot of yogurt though so I have been on the lookout for a good recipe. I came across this one on the blog figjamandlimecordial. It sounded too good to be true. They used a yogurt making system called easiyo and this is quite inexpensive to buy. So I decdided to buy one and give it a go. You don't really need the system if you already have a widemouthed thermos flask. What you do is use long life milk, then you don't need to go through the process of heating and cooling the milk.
One litre of long life milk, four dessertspoons of full cream powdered milk, one dessertspoon of Greek yogurt ( for subsequent batches use your old yogurt). Pour half the milk into the container, stir in the powdered milk, then the yogurt, fill up with the rest of the milk, stir again, screw on lid, fill the thermos up to the insert top with boiling water, place container in the thermos, put lid on thermos and leave for about 12-18 hrs. End result perfect yogurt. I am really happy with this system it is easy, cheap and delicious.