Tomaketheferment,placealltheingredientsinamixerbowlfittedwithadoughhook.Processonlowspeedforabout3minutes(don’toverworkit)oruntilasmoothelasticdoughforms.(Ifyoudon’thaveanelectricmixer,kneadthedoughonacleanworksurfaceforabout10minutes,oruntilitbecomessmoothandelastic.)Makeintoaballandleaveatroomtemperaturefor2hours.Coverwithclingfilmandrefrigerateovernight,orforupto3daysbeforeusing.Puttheflour,milk,sugar,ferment,saltandyeastinamixerbowlwithadoughhook.Processonlowspeedforabout3minutesthenincreasethespeedalittleandmixforanother2minutes(orkneadforabout10-15minutesbyhand).Youshouldhaveasmoothelasticdoughthatdoesn’tbreakwhenstretchedgently.Makeintoaball,placeinaplasticbagandrefrigerateforatleast2hours,orpreferablyovernight.Beforelaminating(folding)thepastry,removethebutterfromthefridge,itshouldbecoldbutmalleable.Usearollingpintogentlypoundthebutterbetweensheetsofbakingpaperintoa20cmflatsquareabout1cmthick.Lightlyflourtheworksurfaceandrollthedoughoutintoarectangle,about20×40cm.Placethebutterononesideofthedoughandfolditoverthetopsqueezingtheedgestogethertocompletelyenclosethebutter.Carefullyrollthedoughoutintoarectangle,about20×90cm(youmayhavetocleartheworktoplikeIdid!).Foldtherectanglefromonelongendbyone-third,sothedoughisnow20×60cm.Foldtheotherlongendoverthetopsothatthedoughisnow20×30cm.Thesefoldsaresimilartothefoldingofalettertoplaceinanenvelope.Coverthedoughwithclingfilmandrestinthefridgeforabout20minutes.Repeatthisfoldingandrestingprocesstwicemore,eachtimerotatingthedough90degreessothatasyourollitouryouarestretchingitintheoppositedirectiontothepreviousfold.Oncethedoughhasbeenrolledandfoldedthreetimesandhadafinalrestinthefridgeforabout20minutes,it’sreadytobeusedtomakecroissants,panauraisin,panauchocolatordanishes.Tomakethecremepatissiere,placethemilk,vanillaseedsandpodinasaucepan.Heatuntiljustbelowboilingpoint,removefromtheheatandallowedtocool,thenletitinfuseinthefridgeforabout6hours.Placetheeggyolksandsugarinabowlandgentlywhiskuntilpale,thenmixintheflour.Gentlyreheatthemilkandpourintotheyolkmixture,stirringconstantly.Sievethemixtureintoacleansaucepanandbringtoboil,constantlystirringwithawoodenspoon.Oncethecustardboils,reducetheheatandsimmerforanother5minutesorso,stirringcontinuouslyuntilthecustardthickensandstickstothespoon.Removefromtheheat,allowtocool,thentransfertoanairtightcontainer.Placeclingflimdirectlyonthesurfaceofthecustard,coverwithalidandrefrigerateuntilreadytouse.Youcankeepitupto3days.Tomakethepraline,lineatraywithbakingpaper.Placethesugarandliquidglucoseinasaucepanovermediumheat.Addthewaterandbringtotheboil,gentlyswirling(trynotstir)untilitturnsadeepcaramelcolour.Removefromtheheatandaddthenuts,thenpourthemixtureontothetray.Setasidetocoolandwhenset,breakintosmallpieces(youcankeeptheminafreezerinanairtightcontainer).Finelychoporblitzinaprocessortothesizeofcoarsebreadcrumbs.Taketheresteddoughfromthefridgeandrolloutintoarectangle,about35×100cm,5mmthick.Ifitkeepsspringingback,restthedoughinthefridgeforabout10minutesthenresumerolling.Ifthedoughistoobigtofitinthefridgesimplyfolditoverandplaceonatray.Cutthedoughinhalftomaketwo35×50cmrectangles.Placethedoughontrayslinedwithbakingpaperandrestinthefridgeforabout10minutes.Layonesheetofdoughonalightlyflouredsurface,withtheshortlengthrunningparalleltotheedgeofthebench.Spreadhalfthecremepatissiereevenlyovertherectangle,spreadingallthewaytotheedges.Topwithone-quaterofthepralinetoevenlycoverthecustard.Startingwiththeshortedgefurthestawayfromyou,tightlyrollthedoughtowardsyou.Wraptheloginbakingpaperandplaceinthefridgeforabout20minutestofirmup.Repeatwiththeotherdough.Removethebakingpaperfrombothlogsandcuteachlogintoslices,about2cmwide,tomakeabout30roundsintotal.Sprinkleovertheremainingpraline,pattinggentlyintothedough(ifyouhavepinkpraline,youcanusesomeatthisstage).Placetherollsbackontothelinedtrays,spacingwell.Coverlooselywithadampteatowelandletthemriseinawarmroom(about25ºC)for1½–2hours,oruntilalmostdoubledinsize.Spraytheteatowelwithwateroccasionallyifitbecomesdry.Preheattheovento220ºC.Removetheteatowelandbrushthetopofeachpastrylightlywitheggwash.Reducetheoventemperatureto180ºCandbakeforabout15minutes,oruntiladeepgoldencolour.Coolslightlyonthetraysbeforedustingwithicingsugar.
