Yogurt is fermented milk and what is required to ferment the milk is the culture or starter which is made from bacterial fermentation.

Please let me state that the milk quantity i used is very small which is why it turned out this way, use more milk quantity and the outcome will be way better than this. Check out this video to see how it turned out when i used more milk    • EASY HOMEMADE GREEK YOGURT START TO F...  

How to make your homemade yogurt
   • HOW TO MAKE YOGURT AT HOME WITH ONLY ...  

Homemade Greek Yogurt
   • EASY HOMEMADE GREEK YOGURT START TO F...  

This video is very explanatory and helpful.

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