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@stueytheround @InvaderGzim Good ideas all, but what I'd like to do is experiment with something that the average CoSoNaut can easily purchase and use themselves without having to cook. That's why I asked for suggestions on commercial syrups. (I'm still looking for suggestions, BTW.)
On that note, I found something: Torani Blood Orange Syrup, on sale for 10% off this month. I might get a bottle and test it out - it sounds interesting!