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How to make dahi
Use whole milk, rather than diluted milk or low fat milk.
Using milk other than whole milk will create a curd that does not set properly and it will be watery, rather than firm.
If you use homogenized milk, you will need more yogurt, as the milk is processed and the particles in the milk have been broken down.
If you use non-homogenized milk, you will need less yogurt as the dahi will set well. Adding too much yogurt will make your dahi very sour.