trying to identify a wine

I once had a phenomenal wine and I'll be darned if I can find out what it was. A friend of mine served it on a road trip once, but I never caught the name of it. It was a reisling, german I believe. It wasn't oaked (or at least I'm pretty sure it wasn't). It had a very distinct characteristic though, the acids had a sweet flavor. It wasn't you're usual sugar sweetness, because this one hit you on the sides of your tongue, not the tip. I asked him what that was and he said it was the acid profile. It was overall a very good wine, fresh, not too alcoholy, a little citrusy. If anyone has a clue which wine this is I'd be very greatful. Also, if anyone can tell me how to get that acid profile at home, that'd' be great too.