I found it. It is one of the six recipes you must make in the Master class:
Recipe #6: Opaque Bar Soap from Self-Produced Lye
Recipe #6: Opaque Bar Soap from Self-Produced Lye
- Produce a bar of opaque soap using either cold or hot process saponification dependent upon the method of self-produced lye.
- Make lye solution from a natural material such as wood ashes or from the electrolysis of table salt or sodium bicarbonate.
- Formulate recipe with at least three different oils, fats, fatty acids, and/or butters.
- Soapmaker is to calculate his/her own lye discount and water content.
- Do not add any fragrance, color, dried herbs, or detergents.
- The bar should weigh 3.5 to 5.5 ounces net and be either individually molded or cut from a log or block.