dioxide gas still trapped in the ground coffee, and the mixture of dissolved and suspended carbohydrates, proteins, phenolic materials, and large pigment aggregates, all of which bond in one way or another to each other and hold the bubble walls together (For the milk foams often served with coffee, seep 26.) This chart summarizes the important features of some common ways of brewing coffee, and the kinds of brew they produce The sta bility of a brew is determined by how many coffee particles remain in it; the more particles, the more bitterness and astringency continue to be extracted in the cup or pet Methods of Brewing Coffee Serving and Holding Coffee Freshly brewed coffee is best enjoyed immediately — its flavor is evanescent The ideal drinking temperature is around 140ºF/ 60ºC, where a sip won’t scald the mouth, and the coffee’s full aroma comes out Because it cools in the cup, coffee is usually held in the pot just below the brewing temperature High heat accelerates chemical reactions and the escape of volatile molecules, so coffee flavor changes noticeably after less than an hour in the pot; it becomes more acid and less aromatic Coffee is best kept hot by retaining its original heat in a preheated, insulated, closed container, not on a hot plate that constantly supplies excessive heat from below while heat and aroma escape above Coffee Flavor Coffee has one of the most complex flavors of all our foods At its base is a mouth-filling balance of acidity, bitterness, and astringency A third or less of the ... closed container, not on a hot plate that constantly supplies excessive heat from below while heat and aroma escape above Coffee Flavor Coffee has one of the most complex flavors of all our foods... the coffee’s full aroma comes out Because it cools in the cup, coffee is usually held in the pot just below the brewing temperature High heat accelerates chemical reactions and the escape of volatile...Serving and Holding Coffee Freshly brewed coffee is best enjoyed immediately — its flavor is evanescent The ideal drinking temperature is around 140ºF/ 60ºC, where a sip won’t scald the mouth, and the