Cut your fats and skins into small pieces and put them in a Stainless Steel pan. Don't use cast iron or any porous metals. Add the water and cook on Low Heat. You should see the liquid turning yellow which means the fat is rendering. NOTE! Don't use high heat and don't let the fats turn brown. The fat has to have a Pale Yellow color at all times.
Continue to cook until all the water has evaporated. This may take 1 to 2 hours depending on the amount of fats and skins you have. Once the water has gone, you will start to hear a crackling sound; a sound from the skins cooking. Stir the skins so that they don't stick to the pan and continue cooking until the skin have turn brown. Turn off the heat and let the fat cool. Strain it if there are impurities, keep in jar and freeze.
The skins have done it's job so you can discard it. Or you it in your next stir fry as special tid bits.
