A friend of ours was having a steer killed by a travelling butcher, and I asked her if she could save the fat. I use the fat to make our own soap with olive and rice bran oil. True to her word the fat was saved and I went to pick it up - four garbage bags of the stuff, must have weighed about 40 kg. Then the big job started, rendering the fat, it takes hours and smells (the wood stove really comes into its own with this job).The fat is cut up into smaller pieces and put in a baking pan in the oven, as it melts, it is poured off into another container to settle. The melted fat is then heated again, strained, and allowed to settle again (so any impurities sink to the bottom). The top is then ladled off into clean containers leaving white fat for making the soap.