Before I ever learnt the Pace Egg song, I heard a wassail song with the chorus

We're one two three jolly boys all in one line
We have come a wassailing and we hope you prove kind
And we hope you prove kind, with your cakes and strong beer
And we'll come no more nigh you until the next year.

I've never heard or seen it since. Is it authentic, or did I witness someone adapting an existing song for a christmas folk club?