The Langar (Punjabi: ਲੰਗਰ لنگر) is a common kitchen where food is served at a Sikh temple (Gurdwara). The concept of Langar was introduced by Guru Nanak, who was the founder of Sikhism and also the first Guru. Because of Guru Nanak's belief in the oneness of humanity and equality, he offered free meals to everyone. Every Gurdwara has a Temple, as required by the Guru Granth Sahib, and the food is served to all the visitors for free. At all Langar, only vegetarian food is served. It usually consists of bread (poori), yogurt and lentils. Samosas and spring rolls are served on special occasions. Kheer may be served as a dessert.