I found The Lovers' Tasks (or "The Elfin Knight") in 80 English Folk Songs collected by Cecil Sharp & Maud Karpeles during the years 1916 to 1918. I really love this song and much prefer it to the similar Scarborough Fair as I find it more tuneful and the lyrics more intriguing.
I used to love singing this song with Kerstin Knie whereby we would share the verses on a gender basis. The song is of lovers giving each other impossible tasks to perform, the tasks being preconditions for love and marriage.

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When with Das Trio it would be sung by Maike Weyerts while I accompanied her on my concertina..

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Lyrics