I've made many hundreds of candles from beef tallow. Find a butcher and buy their beef fat being thrown away. I get mine for $5.00/30 lbs. Render it in a 300 F or so oven in a really big pot in your oven for a very long time until all the fat has been exposed and liquified (rendered). Allow it to cool a bit, strain it and pour it into one pint Mason jars. Allow it to assume room temperature and it will harden and become white in the jars. Pork fat will not harden. Figure out how to weave a thick cotton thread using a series of half hitches into a suitably thick wick. It must be cotton, I use a 7 cord thread. Taking an ice pick, prick the end of a pre cut woven wick and in the center of the Mason jar tallow, simply force the wick down into the reasonably hard tallow until the glass bottom is felt, then pull the ice pick up and out, while the wick remains. Sometimes I will insert 3 wicks in different parts of the candles when I want a candle with more light. There is absolutely no waste of the locally available/renewable fuel. To extinguish the light, lay the jar seal onto the top of the jar and the candle runs out of air. Put the screw cap on, allow to cool and store it for the next time. I believe a single wick in a one pint jar of beef tallow will burn continuous for about 70 hours. When the tallow level gets to about 1/2 inch from the bottom, pull out the old wick, add more rendered tallow and insert a new wick when it's cool and hard.