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Coffe brewed using an ibrik; was: Re: How to explain this?



My long term memory is sometimes good:


"I have spent hours meditating on the brewing and sedimentation of
Middle Eastern coffee as I
prepare demitasse after demitasse of the drink. It seems to be about
the only
coffee drink in which grains of the coffee remain in
the liquid after the brewing process. It is also
noteworthy in several other respects. Why must the
coffee be finely ground? (When you buy coffee for
the drink, you should ask for an extra-fine grind.)
Why is sugar heated with the coffee rather than added
later as it usually is with other coffee drinks? Why
does the liquid suddenly foam up the sides of the
ibrik as the coffee is being brewed? How long must
one let the coffee stand in a demitasse to ensure an
ungritty sip?"

extract from Scientific American:

How Lenses Can Be Made Out of Ice, and What Happens When Coffee Is
Brewing in
the Ibrik
---------------------
by Jearl Walker
April, 1983
-------------

Those who don't have the Tinker's Guild CD of the Sci. Am. Amateur
Scientist will receive an attachment containing this article after
squeaking.

bc



Ludwik Kowalski wrote:

This morning I observed something unusual. A common cup
filled up to about 80% with milk, and with about 1/2 spoon of
dissolved coffee, was placed into a microwave oven. I opened
the microwave door at the moment the milk started rising. Then
I removed the cup and placed it on the table. I was glad that
nothing was spilled. Nothing unusual so far.

About ten seconds later I took a spoon (at room temperature)
and immersed it into the cup. That resulted in a sudden rise of
foam with milk and some of my coffee was spilled. How can this
be explained? Why did placing a cold spoon into the hot coffee-
milk produce a sudden boiling-like =93explosion?=94 I have never
seen anything like this.
Ludwik Kowalski