Re-heating coffee, as most know, is fraught with dangers, and unless the temperature is very carefully controlled the results normally taste bitter and stewed. Well, over the past few weeks, I have been successfully re-heating coffee with no adverse side-effects at all, and I though the idea might be worth sharing. I make my coffee in a Tchibo ceramic filter cone with single-use unbleached filter papers, using freshly ground Monsooned Malabar beans. And when the cup is adequately full, I remove the filter and leave it to drip into a small ceramic ramekin. Now I frequently over-estimate the amount of water required, as a result of which the ramekin ends up with otherwise-would-be-wasted coffee. But what I have found is that if I re-heat the contents of the ramekin for one minute in the microwave oven, and then (and this is MOST IMPORTANT) pour those same contents back through the filter paper for a second time, all traces of bitterness and all signs of being stewed disappear, and the second cup of coffee is as good as the first. Try it -- you may be surprised !
** Phil.