It always makes for a bad day when you reach for your favorite K-cup coffee, brew it up in your Keurig with immense anticipation, take the first heavenly sip and...instead of pure bliss, you taste bitter solids on your tongue. Yep we have all been there once, or twice it is a classic case of coffee grinds in the mug.
Generally, when brewing with a Keurig this is a caused by grinds or tea clogging the exit needle. This blocks the water from clearing the area after each brew. This situation occurs more often with teas, Cafe Escapes and when using the My Kcup but, can happen on occasion with a good old fashioned K-cup.
Luckily, this is a very easy situation to rectify.