I have been having an intermittent problem with sour coffee. According to my research, this is supposed to be due to underextraction. This does not seems to be the problem as far as I can tell. I've made so many changes, one at a time, but nothing solves the problem.
Currently, I use fresh...
Up until this point, I have only used K-cups at work and pre-ground coffee in a drip maker at home. I purchased a bag of Counter Culture 46 roasted 1.5 months ago. It has a weird background taste that is off-putting. So, I picked up a breakfast blend from the local roaster, Fresh Ground. It was...