1.Bring milk to a boil on a low to medium flame.
2. To make thick curd, boil it for a little longer till a layer of cream forms on top. Cool down the milk to luke warm.
3. Add a tsp of curd.
4. Stir to mix the curd well with milk. cover and keep in a warm place for about 6 to 10 hours depending on your climate. Some folks use a broken red chili to set the yogurt well. If needed break a red chili and just put it in the milk. milk does not get spicy or hot.