The only thing you need is to collect the cream that settles on top of milk after you boil it. Collect a good amount of it . Grind it in a blender along with ice cubes. Butter will come out. Pour it in a
kadai and heat it on low flame till ghee comes out. Strain the ghee and store it. It solidifies once it cools down. The pictures will make it clear when to know the process is complete.