Greek Yogurt

Ingredients

bring the milk to 45°C (113°F)
pour the yogurt into the milk
wisk well
bring the milk to 45°C (113°F) again (don’t go higher than that, please)
boil some water (about 100ml) and use it to wash the thermos from inside
let the water out and pour the milk into the thermos
leave the thermos in the oven(or in any other place whithout air flow) for 12h
pour the newly obtained yogurt into the cheesecloth.
hang the cheesecloth for 30 minutes to 4 hours, depending on the desired density (the longer the denser)
store in the fridge