As the PP said, you can get an alcoholic mint julep at some the lounges and bars in WDW, but the version that DL has is unique to DL. I have to admit that I had a "real" mint julep for the first time recently and I agree with the folks that say that the one DL serves at the French Market and Mint Julep Bar is nothing like a "real" mint julep. For me, I much prefer the one at DL!