Absolutely avoid this place if you’re gluten free. There’s a few Holy Cow venues around Manhattan, but I can only talk for the LES/Chinatown location.
We went in at a really quiet time, and I ordered the GF hotdog, GF Tenders and a GF burger (with so much on the menu thought it would be good to sample a few bits).
The quality of the food overall was average IMO, but the big problem was with the burger. I questioned 3 times if it was a GF bun as it seemed too good to be true - it was soft and looked ‘normal’
Always. Go. With. Your. Gut.
I have never in all the years of eating GF and being accidentally glutened have I been in so much pain after a meal. It completely ruined my flight back to the UK, and I’m still suffering badly a few days later.
I’d steer well clear if you’re sensitive.