教你自制冰淇淋英文版Word下载.docx
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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
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