"Trinity Cake" was first published in "Old-Time Songs and Poetry of Newfoundland," (The Gerald S. Doyle Songbook), with no author cited. First edition 1927, fifth edition 1978 (with musical score); GEST took it from the 3rd. ed., 1955. No author given; don't know if the song appeared in the first edition.
The lyrics posted by Joe and attributed by GEST to Johnny Burke are the same.

Also published in several editions of a booklet of "Newfoundland Songs," Bennett Brewing Company Limited (no score).