recipe: priorities: Calculate the selected unit of the unit kinds first. Then perhaps afterward, convert those units into other units. "mass + mass equivalents": { "per recipe": { "grams": { "fraction string": "0" } } }, "biological activity": { "per recipe": { "IU": { "fraction string": "0" } } }, "energy": { "per recipe": { "calories": { "fraction string": "0" } } }