The first step involved in preparing curd is to heat and boil the milk under a low flame. So, add full fat milk to a heavy-bottomed pan.
Keep stirring the milk to reduce the layers of the cream (malai) formation.
Once it is boiled, lower the flame and let it simmer for a few minutes. After simmering the milk for a few minutes, let it cool down from hot to a little warm temperature.Tip — Ensure that the milk is boiled well; otherwise, you will end up with slimy/ lacey curd that is barely set and tastes unappetizing. You may check if the milk is at the right temperature before adding the culture by inserting a finger. If the milk feels comfortably warm, go on and add the starter. But if the milk still feels hot and gives the finger a burning sensation, wait a few more minutes until it cools down to the desired temperature.
You can use a thermometer; too, the ideal temperature should be between 37-45 degrees C.
Once the temperature of the milk is perfect, pour the warm milk to a container.
Add the starter/culture.
Blending the culture with the milk is essential for adequately setting the curd. Ensure that the bits of curd culture are not left in the milk in lumps. If you find any lumps, remix it until well incorporated.
Once the starter is introduced to the milk, cover the container with the lid and keep the container in a warm place undisturbed for about 7 to 10 hours or until set. Tip — The dahi needs a specific minimum time to set properly and should not be disturbed while it sets. Once the dahi is set, do not insert the spoon right away to check if it is done. Instead, slightly tilt the container to check if it has set and become firm. If it jiggles and feels loose, let it remain undisturbed for some more time.
After the approximate time has elapsed, and the dahi is set, place the container in the fridge, which will help it firm up further. Refrigeration is an essential step in setting a firmer dahi.
Your homemade curd is ready to be relished with your favorite meal.