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I have a carafe of coffee brewed today that is still mostly full, and I would like to serve it tomorrow.

How can I reheat it without negatively impacting the flavor?

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I was told by my Italian friends that if you make Coffee in a Moka, you can keep it for the next day and re-heat it and it doesn't loose flavour.. I have tried it with limited success.. –  notthetup Feb 14 '11 at 13:15

2 Answers 2

up vote 15 down vote accepted

It's not going to be nice to drink a day later, no matter what. I'd use it in baking a chocolate cake or something like that instead, if you can't bear to throw it out.

The problem is not just the reheating, which will further cook the coffee and affect flavour, but that it's been losing aroma and oxidizing for a day first. If you're serving it to anyone you like even a little bit, serve them fresh coffee!!

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+1 - Serve them fresh coffee with tiramisu made with old coffee –  mouviciel Feb 13 '11 at 8:39
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I think that the process of re-heating alone will wreck the flavor. If you can refrigerate it before it's too old (in an appropriate container) you might be able to server it as iced coffee. –  uncle brad Feb 13 '11 at 15:52
    
Using it for coffee or mocha ice cream is another option. –  Allison Feb 13 '11 at 19:41

I've recently been experimenting with this, and the best I've come up with is mixing it with hot milk.

I make 2-cup stove top espresso machine each day, 1 for the morning and 1 for the afternoon. I used to drink the afternoon cold as I couldnt find any other way to drink it and it still taste nice.

But now I put about 50ml of milk in the cup, heat it in the microwave for 30 seconds to get it nice and hot, then add the cold coffee (as its espresso its probably 50 - 100ml). It helps that I don't like super hot coffee anyway - luke warm and tasty.

Overnight however I'm unsure how much the flavour would deteriorate.

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Update: I didnt have time for a second cup yesturday, so left it in the stove top over night. Mixed with warm milk, it seems to have lost a little flavour but is probably the best reheated coffee I've made. YMMV –  NBenatar Oct 22 '13 at 9:05

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