10
votes
3answers
11k views

Why does coffee taste awful after reheating it in a microwave oven?

I brew my coffee with a percolator using finely ground beans and it comes out great when it is still hot. However, I have to brew at least two cups in the machine. So if I make coffee in the morning, ...
2
votes
2answers
1k views

Sugar forming tiny bubbles in microwaved coffee?

When I heat up coffee in the microwave and then pour in sugar, a layer of tiny dense bubbles forms at the top of the glass and stays there for the duration of the drinking, diminishing slightly over ...