After boiling and cooling milk keep it in the fridge for 24 hrs. Then remove cream.Keep cream in freezer so that it will not stink. Collect cream for a week.
Take out, add starter(curd) and keep it at room temp. for 6-8 hrs depending upon the weather.It should not become sour.
keep it in fridge for 2 hrs.
Take a big bowl, add 1 tb.sp. water and transfer cream in this.Beat till butter is separated from curd.You can use hand mixer, elect. mixer or use a spoon and move in circular motion.
Add a cup of water and beat with hand for some more time.Butter will come up.
Take half cup cold water in a kadai.Take out butter in this.Leave the butter milk aside.
Fold it nicely so that what ever curd is there will be separated from butter.Remove water.
Repeat this process.Your butter will be washed and it will have less of curd in it.(you can use this butter for making cake)
Place it on low flame stirring continuously.
When you see brown at the side it is done.
Let it cool for 20 min and strain with a metal strainer.
Store in air tight container.
Strain butter milk and use it for kadhi or just drink it.
If you don t have cream you can use salted butter but it has different flavour.