Add baking soda, salt in Jowar flour and sieve it twice.
Add Jaggery and Butter in a bowl and with an electric beater, beat it till it fluffy and light brown.
Now gradually add flour in the butter mixture and mix it all together.
Add cumin powder and use fingers to rub all the butter into the flour.
Now add little milk and bring together all the mixture to form a soft dough.
Put this dough into a cling wrap and keep this in refrigerator for 5 to 10 mins.
Preheat the over for 10 mins at 180 degrees and roll up the dough into 1/2 inch thickness and then cut into small shapes.
Bake for 8 mins on one side at 180 degrees and then flip over and bake for another 3-4 mins. Let this cool for 10 mins as then they turn crispy.