A big piece of ginger, 3 tumeric roots, 3 garlic cloves, 3 limes and a lot of gin. The gin is a preservative. The solid ingredients are traditionally mashed with a mortar and pestle, but you can use a blender.
This is an Aleister Crowley style concecration ritual.
Talk to the potion and tell it it's life purpose, which is to help you rapidly lose weight. You'll need a candle large enough to burn for at least 24 hours. The Mexican jar candle in the video will burn for several days straight. You need to let the candle burn for as long as it takes to fully consume itself. A candle burning for days can easily burn your house down, so exercise appropriate caution. This can be done outside, which is safer. Nature is an ideal setting for magical rituals.
Retain you semen for 3 - 28 days before making the potion.
You can charge up the potion further by leaving it outside under the full moon.