The food lab better home cooking through science ( PDFDrive ) 233
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ofthesamespiceyouusedearlierinstep4canbeagood
waytoboostflavor.
Ithinkofthegarnishasafinalsteptolayerflavorand/or
textureintothebowl.
Step9:RinseandRepeat
Once you’ve got these eight basic steps down, you’ve got
whatittakestostartcreatinganynumberofcreamysoups,
combining any flavors you like. I’m not promising that
every single combination of vegetables and aromatics will
work out, but use this guide as a blueprint and you’re well
on your way to building the soup of your dreams.We all
dreamaboutsoup,right?
BOOMGOESTHEBLENDER
H
ere’s a scenario that happened to me just last
week: I was making a batch of tomato soup for my
wife(whocan’tgetenoughofthestuff),andI’djust
dumpedthehottomatomixtureintotheblender.As
IreachedfortheOnbutton,atinyvoiceintheback
of my mind said to me,All of this has happened
before, and all of it will happen again.Ask yourself
thisquestion:“Wouldanidiotdothis?”Iftheanswer
is“yes,”thendonotdothisthing. Of course, I went
ahead and turned on the blender anyway. The top
poppedoffinaviolentexplosion,andmydogleaped
behind the couch in fear as hot tomatoes splattered
across the apartment with all the fury of aVEI-7 ‡
volcaniceruption.Thiskindofstuffhappensbecause
there are some mistakes I never learn from and,
moreimportant,becauseofthermodynamicsandthe
physicsofvaporformation.
See,thereareanumberoffactorsinvolvedinthe
conversion of hot water to steam. Pressure is a big
one. As we all know, steam takes up much more
space than water. Because of this, if you apply
enough pressure to a body of water, steam will not
escape.Whenabigbatchoftomatosoupissittingin
a blender, there is significant pressure on all of the
soup except the stuff at the surface. Steam escapes
fromthetopalone,whiletheliquidbelowthesurface
sits there patiently waiting its turn. Switch on the
blender, though, and suddenly you create tons of
turbulence.A vortex is formed, the surface area of
that body of liquid suddenly becomes much bigger,
and steam is rapidly and violently produced.
Moreover, the added exposure will also heat up the
air in the headspace of the blender, causing it to
expand.Thisrapidexpansioncausesthetopofyour
blendertopopoffandthehottomatoestogoflying.
BOOM!
So, how do you prevent it?There are two ways:
Firstoff,makesurethatthere’sroomforexpansion
intheblender.Thehotsteamneedsanescapevalve.
