just an idea - i add the refrain :
come and buy your love potion at Scarborough Fair

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commentary: the text is a list of very poetic magical sounding but impossible things to do - as a test of love ... maybe it expresses a longing romantic feeling - maybe its just having a bit of a laugh about sex ... arrogantly teasing each other - "if you climb that rainbow, then you can have me"

originally the song must have been melody based .. it can be sung over a single note bass

sorry i cant remember where i copied the following text but it is the fullest i have seen - typical of the long ballads of yesteryear.

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Both:

Are you going to Scarborough Fair?
Parsley, sage, rosemary and thyme,
Remember me to one who lives there,
For she once was a true love of mine.

Man:

Tell her to make me a cambric shirt,
Parsley, sage, rosemary and thyme,
Without no seam nor fine needlework,
And then she’ll be a true love of mine.

Tell her to wash it in yonder dry well,
Parsley, sage, rosemary and thyme,
Which never sprung water nor rain ever fell,
And then she’ll be a true love of mine.

Tell her to dry it on yonder thorn,
Parsley, sage, rosemary and thyme,
Which never bore blossom since Adam was born,
And then she’ll be a true love of mine.

Ask her to do me this courtesy,
Parsley, sage, rosemary and thyme,
And ask for a like favour from me,
And then she’ll be a true love of mine.

And when you have done and finished your work
Parsley, sage, rosemary, and thyme.
Then come to me for your cambric shirt
And then you'll be a true lover of mine.

Both:

Have you been to Scarborough Fair?
Parsley, sage, rosemary and thyme,
Remember me from one who lives there,
For he once was a true love of mine.

Woman:

Ask him to find me an acre of land,
Parsley, sage, rosemary and thyme,
Between the salt water and the sea-sand,
For then he’ll be a true love of mine.

Ask him to plough it with a sheep’s horn,
Parsley, sage, rosemary and thyme,
And sow it all over with one peppercorn,
For then he’ll be a true love of mine.

Ask him to reap it with a sickle of leather,
Parsley, sage, rosemary and thyme,
And gather it up with a rope made of heather,
For then he’ll be a true love of mine.

When he has done and finished his work,
Parsley, sage, rosemary and thyme,
Ask him to come for his cambric shirt,
For then he’ll be a true love of mine.

Both:

If you say that you can’t, then I shall reply,
Parsley, sage, rosemary and thyme,
Oh, Let me know that at least you will try,
Or you’ll never be a true love of mine.