I accidently under roasted a catch of columbian bens... they are a light brown colour (no. 8-9) on
http://www.sweetmarias.com/roasting-VisualGuideV2.html
it turns out that this roast is not quite to my taste for espresso. Very sour. Would any other methods of brewing suit the bean better or will it always be really sour?! I'm just about to try the moka pot but I'm guessing it will be a similar flavour. I don't have any other coffee making equipment - french press etc., so is it worth me getting something to try and enjoy these beans? Or shall I just bin the lot?!