help identifying taste

A Bock from a locally produced kit (Black Rock, New Zealand) has a funny feel/flavour I'm having trouble identifying...

I could best describe it as a bit like Tonic water, or maybe like Coke from Maccy D's when the post-mix syrup is running a bit low.

It didn't start off like that. After about 2 weeks in bottles, it seemed a bit maltier and fuller than it is now, at 6-8 weeks. It was bottle-stored at about 18-20c (68f), and was fermented (not at good lager temp!!!) at about 22-24c (73f). The FG was high at 1012. I used DME with the kit.

I'm serving it not too cold, half an hour or so in the fridge to chill it a bit.

What do you call that tonic-water taste? Any guesses on what's gone on there?

Thanks!!!

never heard of 'tonic water' off flavor...but then again i've only had tonic water with added Gin

what yeast was used? if it was a lager strain, brewed at ale temps, you'll get a different flavor in the end due to the stress on the yeast. might be phenols you're tasting, or esters, or Extract 'twang' (Yes, I believe in it).

Let those beers chill for days...not hours.

It will make a big difference in how the carbonation "settles" into the beer.

Right, I'll stick a couple in the fridge tonight and drink them the following night and see if it makes a diff. Thanks for that tip.

Of course, I guess if it tastes like tonic water, I could just add gin .

Honestly, 48 hours is the minimum for chilling beer properly in my book.