This one is half cheese journey and half recipe. I was asked for it by a colleague though, so here it is. Yogurt making is not massively new to me. I have done it a few times, and have enjoyed trying out different starter yogurts and seeing the effect different ones have on the final yogurt. It is very easy to do an the result is satisfying. If the yogurt is not as thick as you'd like, simply strain it. Then you have yogurt as well as whey to use. The key to this as far as I am concerned, is to use a good quality milk. Mine was quite thick, with an almost flan-like consistency, but we strained it a little anyway.
2 l milk
3/4 - 1 c yogurt with active cultures
1) Place milk in a saucepan and heat over medium until it is warm but not too hot. You should be able to dip your pinky finger in and leave it for a count of 10 without being uncomfortable.
2) Add the yogurt to the milk and stir. Cover the saucepan and place in a warm spot to ripen over night or longer. A spot in the sun, by the fire or by a radiator are great. I usually put mine in my Wonderbag cloth oven as it maintains the temperature over a long period without using any energy and without risk.
3) Strain as needed.
I particularly like home-made yogurt for dishes like borani where the flavour of the yogurt itself is key. Depending on the starter yogurt used the end-yogurt may be more acidic or sweeter. Play around with it and figure out which you like best!