What is
Kefir is fermented milk made by using kefir grains containing benefiicial yeast as well as probiotic bacteria found in the yogurt.
  
Lassi is a popular, traditional, yogurt-based drink from the Indian Subcontinent and is popular in India. Lassi is a blend of yogurt, water, spices and sometimes, fruit
  
Origin
North Caucasus regions
  
Europe, Greece, Italy