Mustard is the second solo album by Roy Wood, who wrote and produced every track and painted the cartoon-style cover. It was completed and released about the same time as he disbanded his group Wizzard. He played all the instruments, and contributed all vocals apart from guest appearances by Annie Haslam, Phil Everly, ex-Move and Wizzard bassist Rick Price, and co-engineer Dick Plant.
"Look Thru’ The Eyes of a Fool" (1975) and "Any Old Time Will Do" (1976) were released as singles, though like the album, neither made the charts.
The album was re-issued in 1977 in Australia, along with the tracks "O What A Shame" and "Rock 'n' Roll Winter" by United Artists/Jet Records, entitled Roy Wood The Wizzard.
It was later reissued on CD by Edsel Records, with additional tracks which had previously appeared only on singles.