How to make a yogurt guide

[RuudVanNistelrooy]

It's actually easy. All you need is 1L of at least 3.5% fat milk, sieve which has to be clean and kefir cultures or even some store bought yogurt.
If you don't have kefir just use 2 spoons of yogurt in 1L of milk in the glass bottle. Close it, shake it and leave it to rest for 10 - 12 hours at 24-38 Celsius temperature. After that run it through your sieve a couple of times depending on if you want thicker structure of yogurt. Don't throw away the whey because it is useful.