I've found plentiful recipes for horchata, including one right here on Chow, but the reviews are really lacking on that particular one, mostly just a debate about Mexican vs. Spanish styles. And they're really conflicting (like most reviews) on the ones on other food sites. There's an LA Times recipe, and I like the one other recipe I've made from there, but is that enough to go on? Sigh.
So if anyone here has a TRIED AND TRUE recipe for horchata, please share! I've been assigned to make a vat of it for a friend's summer party, and I want it to be a hit! But if there's seriously a black hole of horchata experience out there, I will just have to try all the likeliest recipes and report back!