Take a cooking pot or sauce pan, pour milk into it.
Turn on the heat and bring the milk to a boil.
Keep stirring the milk once or twice while boiling.
Keep the flame medium to low while boiling the milk.
When the milk boils well switch off the flame.
Allow it to turn warm and not too hot.
Pour the milk into a steel bowl or a casserole.
Check the temperature of the milk and it should be warmer than lukewarm but not too hot while touched.
Into the warm milk, add a tablespoon of curd starter if the curd starter is sour and if the curd is sweet add 2 tsp.
Stir the milk well.
Cover the lid of the bowl or the casserole used.
Keep it in a warm place for 7-8 hours or until the curd is set sometimes overnight.
Thick curd will be ready to use after 7-8 hours.