You will need
    • milk – 1 liter;
    • the yeast – 2-3 tablespoons;
    • thermos.
Instruction
1
Boil the milk in a regular pan and then cool to 40-45 degrees. To check the temperature without using a thermometer, simply place a clean finger in the milk – if within 10 seconds you will not feel discomfort, that is, the finger will be warm, but not hot, it means that the milk is ready for making yogurt.
2
Add in the warm milk the yeast and stir thoroughly with a whisk. The role of the starter culture may be a special starter culture for yoghurt, and the usual "live" yoghurt, that is, one whose shelf life does not exceed 14 days.
3
Quickly and thoroughly mix the yeast with the milk, pour the mixture into a prepared flask. Before you use a thermos, it should pour boiling water in addition to dairy bacteria do not multiply additional.
4
Wrap the thermos in a towel or blanket and put in a warm place. In winter you can put it near the battery, in the summer – in the sun. In this position, the thermos of the future of yogurt is left to 4-7 hours.
5
After the specified time, open the thermos, and yogurt, pour into jars or other containers. Jars put in the refrigerator for 2 hours. This is necessary to stop the growth of milk bacteria and the yogurt was not sour. The yogurt is ready.