Plum

Plum as in a plum job, meaning a post that rewards well while not requiring great effort, dates in this sense from the late 18th century and derives from the sweet raisins found in plum puddings. Plum meaning a sweet raisin dates from even earlier, from c. 1660, according to the OED, and would have been the plum that Little Jack Horner pulled out of his Christmas pie with his thumb, in the 18th century nursery rhyme.