to all the Sikhs here, I need help

Hello guys. I'm a Hindu who goes to gurdwara with my sikh father every week and I love it. i feel so peaceful there. the only thing is, while I'm not vegan for health reasons, I will be once I can and I'm wondering how I would eat Prashad and langar there? when you walk out from the room wear you pray (forgot what its called, I'm very new to this lol) instead of having someone walking around offering it to you, outside there's a man sitting on the floor who serves it. I feel like it's be disrespectful to just walk past them and not have some Prashad? I don't even know if it's allowed. I also don't know what I would eat at langar, I could of course not eat langar and eat at home but sometimes I don't have time and it really helps. any help is super appreciated, thanks in advance.