The Langar or free kitchen was started by the first Sikh Guru, Guru Nanak Dev Ji. It is designed to uphold the principle of equality between all people of the world regardless of religion, caste, colour, creed, age, gender or social status. In addition to the ideals of equality, the tradition of Langar expresses the ethics of sharing, community, inclusiveness and oneness of all humankind. “..the Light of God is in all hearts.” (sggs 282)
The institution of Guru ka Langar has served the community in many ways. It has ensured the participation of women and children in a task of service for mankind. Women play an important role in the preparation of meals, and the children help in serving food to the pangat.
Langar also teaches the etiquette of sitting and eating in a community situation, which has played a great part in upholding the virtue of sameness of all human beings; providing a welcome, secure and protected sanctuary.
Everyone is welcome to share the Langar; no one is turned away. The food is normally served twice a day, every day of the year. Each week a family or several families volunteer to provide and prepare the Langar. This is very generous, as there may be several hundred people to feed, and caterers are not allowed. All the preparation, the cooking and the washing-up is done by volunteers and or by voluntary helpers (Sewadars).
Besides the Langars attached to gurdwaras, there are improvised open-air Langars at the time of festivals and gurpurbs. Specially arranged Langars on such occasions are probably the most largely attended community meals anywhere in the world.
There might be a hundred thousand people partaking of food at a single meal in one such langar. Wherever Sikhs are, they have established their Langars. In their prayers, the Sikhs seek from the Almighty the favour:
“Loh langar tapde rahin.”
“May the iron pots of Langar be ever warm (in service).”
Source: Sikhi Wiki