No particular legend around julep, I don't think, Sweetie. It's very prosaic, acc'g. to Atomica:
ju·lep (jū'lĭp)
n.
A mint julep.
A sweet syrupy drink, especially one to which medicine can be added.
[Middle English, a sugar syrup, from Old French, from Medieval Latin, from Arabic julāb, from Persian gulāb, rosewater : gul, rose (from Middle Persian vardā) + āb, water (from Middle Persian āpfrom Old Persian).]


However, I did find a neat link that includes the legend of mint:
http://home.att.net/~ejlinton/dom_mint-julep.html

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Alex, that's a great story! I'm surprised: when most foreigners I've known of hear Kentucky, they think "Fried Chicken". I was amazed to see, on one of the first pages of a guidebook to Indonesia, Saya mau ayam goreng Kentucky: "I want Kentucky Fried Chicken".

For the record: yes, I am a Kentuckian born and bred, but I think whiskey is horrid and bourbon abominable--though it smells good.