alt Hacker NewsIf the restaurant doesn't have anything besides a menu, /index.pdf is fine—no web design required; reuse the menu they're printing anyway.
The trade-off is that they'll have to pinch/zoom if they have a small display. It's a minor inconvenience to make the exact information they want available instantly.
index.pdf won't tend to play nicely with screen readers and also sucks for people on crappy mobile networks, so it's a minor inconvenience for some, and straight up unusable for others