As part of a general investigation into mutton quality, the relative contribution of mutton fat and lean to general palatability was studied.A trained taste panel could not identify the predominant meat in mixed-species patties and showed no preference for lean beef or lean mutton patties when judging flavour and aroma. With up to 10% mutton fat added, the patties increased in acceptability, but declined to an unacceptable level at higher additions. The lean patties were improved by adding beef fat, reaching a maximum of acceptability at the much higher fat level of 30%. This offers the prospect of upgrading lean mutton and beef fat by using them together in mixed-species products.