How to Render Tallow for Soap and Candles

By David Fisher, About.com Guide

The size of your fat chunks will determine how long you have to boil the mixture. For my pre-ground fat, I only had to simmer it about 20-30 minutes. If the chunks were larger, it will take longer. Just keep it simmering over a low heat and stir often. You can also take your potato masher and mash the fat a bit. This will help squeeze the oil out of the meat/chunks.