教你自制冰淇淋英文版Word下载.docx

教你自制冰淇淋英文版Word下载.docx

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Wealsousearecipethatisparticularlydelicious.

Whatyouneed

∙½

cupsugar

∙¼

teaspoonsalt

∙1cupmilk

∙3beateneggyolks

∙1tablespoonvanillaextract

∙2cupschilledwhippingcream

∙Optional:

2cupsfreshstrawberriesandextra½

Thecookingphasecanbedoneadayortwoaheadoftime,sonoonehastowaitforthereallyfunpart.

Setoutalloftheingredientssoeverythingiseasilyathand.

Putthesugar,salt,andmilkintothetoppanofadoubleboiler.Thewaterinthebottompartofthedoubleboilerwillboil,andthetemperaturewillneverriseabovetheboilingpointofwater.Thisensuresthatwedon'

tovercookthemixture,evenifwegetdistracted

Stirthe3beateneggyolksintothemilkandsugar.

Cookthemixtureoverboilingwateruntilyoucanseebubblesformingaroundtheedgesofthemixture

Themixtureisdonewhenitissomewhatthick,andcoatsthespoon.

Letthemixturecooltoroomtemperature.

Whenthecustardhascooled,stirinthevanillaextractandtheheavywhippingcream

Thefunpartisabouttobegin.Thisiswherehavingabunchofkidstohelpisreallynice.

Pouracupoftheicecreammixtureintoaplasticzip-locksandwichbag.

Zipthebagclosed,andputitintoanothersandwichbagforsafety,andzipthatoneclosedaswell.

Fillagallonsizefoodstoragezip-lockbagaboutonethirdfulloficecubes.Addacupofsalt（weusedrocksalt,butanykindwilldo）.

Zipthelargebagclosed,andwrapitinatoweltokeepfingersfromgettingtoocold.

Makeabagforeveryone（thisrecipewillmakeenoughforthreeorfourservings,andyoucandoubleorquadrupletherecipeifyouarehavingaparty）.

Nowhaveeachpersonsquishthelittlebagaroundinthesaltandice,makingsurethattheicecontactsthelittlebagasmuchaspossible,andthatthelittlebaggetslotsofkneading,tokeeptheicecrystalstiny,sotheicecreamisverysmooth.

Thekneadingstagetakes10minutes.Youcanlettheicecreamsitintheiceforanother5minutesifyoulikehardericecream,althoughcontinuingtokneaditfortheextra5minutesisalsoOKtodoifyou'

rehavingfun.

Youwillknowtheicecreamisdonebyfeelingthemixturebecomeapasteinsteadofaliquid.Whenyoutakethelittlebagoutoftheice,wipeoffthesaltwater,andthenremovetheouterbagcarefully,soyoudon'

tgetsaltintheicecream.Thelittlebagwillstandupinthebowl,becauseitisafrozenpaste.

Youcanspoontheicecreamintoabowlifyoulike,orjusteatitoutofthebag.

Ifyoulikestrawberryicecream,mash2cupsofstrawberrieswithahalfcupofsugar,andaddahalfcuptoeachsmallbagbeforeclosingitupandputtingitintheice.

Theresultisanamazinglydelicioushomemadeicecream.

Howdoesitdothat?

Foricetomelt,ithastogetheatfromsomething.Inouricecreamproject,itgetstheheatfromtheicecreammixture（andfromyourhands,whichiswhytheygetcoldwhileholdingthebag）.Whentheiceismelting,itisat0degreesCelsius（32degreesFahrenheit）.

Wheniceismelting,thesurfaceoftheiceiswet.Atthesurface,thereissolidiceononeside,andliquidwaterontheother.Thesurfaceisexactlyatthefreezingpoint.Thismeansthatsomewatermoleculesareleavingtheiceandmovingintothewater,butitalsomeansthatsomeliquidwaterisrefreezingontotheice.Wesaythatthesystemisinequilibriumwhentherateofmeltingisequaltotherateoffreezing,andthishappensat0degreesCelsius.

Atequilibrium,theheatlostbythewaterasitfreezesisequaltotheheatgainedbytheiceasitmelts.

Becauseplainicecanonlybarelycoolsomethingtothefreezingpointofwater,wewillneedtodosomethingtomakeitmuchcolderthanthat,sinceouricecreammixturefreezesatalowertemperaturethanwater.

Theicecreamfreezesbecausethesaltandtheicemixtomakeasubstancewithalowerfreezingpointthanicealone.Thismeansthattheiceandsaltmixturemustgetevenmoreheatfromsomewhereinordertomelt.

Saltywaterfreezesatalowertemperaturethanplainwater.Buttheiceismadeofplainwater,soitmeltsat0degreesCelsius.Sincetheicekeepsmelting,butthewaternolongerfreezes（becausethereisonlysaltwater,whichdoesn'

tfreezeat0degrees）,thetemperaturegoesdown.

Theheatgainedbytheiceasitmeltsisnolongeroffse