Mattha

Mattha is a beverage that originates from the Indian subcontinent. It is made from dahi (yogurt) or buttermilk mixed with spices and sugar. Plain buttermilk is also called Mattha in the Indian states of Bihar, Tripura, Uttar Pradesh, West Bengal and Bangladesh Ingredients added to buttermilk to make mattha may include mint, roasted cumin seeds, asafoetida, curry leaves, salt and sugar. Mattha may also be smoked before serving for flavour. It is generally served before or after a meal, though it can also be consumed with the meal, and it is thought to help with digestion. Mattha is similar to Chaas, which is also called chhanch or ghol, but spicier and is known as Mohi in Nepal. Lassi is a popular summer yogurt drink from India, Bangladesh and Pakistan.

Source: Wikipedia