My wife's mother used to sing her a song before she passed on, but she can only remember bits of it. I'm looking for the song's title and lyrics. It may be a kid's song but someone suggested I try a folk music forum. Here's what I have so far:

There once was a boy, there once was a girl, living in the land of Nod.

He asks her, "can you give me just one kiss?"

She says she will not kiss him until "apples grow on the lilac tree."

He leaves very sad, so she has a change of heart. The next day he sees her "hanging apples on the lilac tree."

I've already confirmed it wasn't R.L. Stevenson. Any help would be appreciated.