The Sikh Gurus were PRACTICAL PEOPLE...BHOOKHEH BHAGAT NA KEECHEY...a hungry man cannot concnetrate of Spiritual subjects...
Thats why there is SHABAD DA LANGGAR...spirituality..and there is GURU KA LANGGAR..food for the stomach...
Karrah Parshaad is simple food easily prepared by just about anyone..every house has ATTA, SUGAR, GHEE and WATER. Even the poorest of the poor could have all these in his house. For "short" session of Shabad Langgar acompaniement...this Karrah parshaad is PERFECT....so that after having tasted the AMRIT SWEETNESS fo SHABAD...in the MIND...the tongue and stomach also get their "food".
2.
SPIRITUAL Connotation....EQUALITY. IN mkaing Karrah prshaad its
MANDATORY that EQUAL PARTS of atta/ghee/sugar/water be USED. Another ingrdient specifiacally REQUIRED is Naam - usually JAJI SAHIB is recited while rpepapring it and no outside talk/gossip permitted. The JAPJI also serves very well as an automatic TIMER...becasue the ATTA must be perfectly roasted in GHEE..before the Sugar/water mixture is applied...too late..and the Parshjaad becoems over cooked/dark and reelases GHEE whcih DRIPS out...and too soon..and the karrah is PALE...STICKY like GLUE..and difficult to distribute/eat...(Atta being undercooked) Japji sahib read at normal speed is perfect timing !! In my personal experience ....150 years of making this havent got it wrong even once..always PERFECT.
3. EQUALITY in INGREDIENTS..is followed by EQUALITY in DISTRIBUTION..every one gets a portion...no discrimination among poor/rich/man/woman/low/high caste /religious differences etc etc.. ALL Have to be SEATED and served in PANGAT in the DARBAR SAHIB....(although not mandatory as conveneince can be allowed for). Karrah parshad is NEVER served in Guru Ka Langgar........../its place is DARBAR of GURU. One has to ATTEND the DARBAR to get it.
4. UP to the 1920s when the Singh Sabha took control of darbar sahib Amrtisar and otehr Gurdwaras...the Karrah parshaad was prepared by HALWAII SHOPS...BOUGHT by weight by sangats and presented to darbar as offering and distributed. When the SGPC came into being and a large sum of money was needed for the BUILDING of Langgar and REST ROOMS fot eh sangat..it was proposed by a Sikh Employee of SGPC that it be suggested to the Halwaii shops that they contribute 10% of theri parshaad/restroom rental income to the SGPC for that purpose. The Buisnessminded halwaiis flatly REFUSED. Hence the SGPC took the decision to begin Preparing karrah parshaad IN THE GURDWARA SAHIB and BANNED all OUTSIDE karrah parshaads. The Halwaiis rasied a huge hue and cry..but it was too late...their days were over...soon the SGPC had eneough money to build the first Hostel in the darbar sahib Complex for visitors benefit. Then ALL GURDWARAS everywhere began to make ther own Karrah parshaad...
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=36788Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=36788
5. NANAKSAREE THAATHS (not Gurdwaras) DONT have Karrah Parshaad...or Nishan sahib and dont call their places GURDWARAS and thus have no GURU ka Langgar as well. These Babas began the habit of giving out SUKKA Parshaad..DRY Parshaad..rioorriahn (sweets bought form halwaiis)..sugar patahsans etc etc. THIS has the advantage that it can be RE-USED, RE-CYCLED, RE-SOLD...and STORED and requires no manpower to Cook etc. Very COMMERCIAL OPERATION.
6. Ceretian Sikhs under Hindu influence also bring along different "parshaads" bananas,,apples fruits, coconuts, sweets, etc etc for distribution at Gurdwara Functions. Some follow Hindu practises such as Cholleh parshaad on Saturdays becasue the Shanni Devta loves this..etc etc..ALL these are NOT as per SRM.