According to the nursery rhyme, what fruit did Little Jack Horner pull out of his Christmas pie?

The story behind the answer

The rhyme says it plainly: “Little Jack Horner sat in a corner, eating his Christmas pie; he put in his thumb and pulled out a plum.” So the fruit is a plum.

Interesting twist: “plum” long meant a lucky prize or windfall, which fits the boast, “What a good boy am I!” There’s also a colorful (though likely apocryphal) tale that the rhyme satirizes Thomas Horner, a steward who supposedly carried property deeds hidden in a pie during Henry VIII’s time and “pulled out” the manor of Mells—his “plum.” To remember it, link Christmas treats to plums: plum pudding, plum cake, and Jack’s Christmas pie—