Are you sure it wasn't a scam to rip you off? I'm born and raised in Tehran and numerous times I had gone out for dinner passed mid-night, and I simply walked into a restaurant, ordered the food, and ate (assuming the kitchen was still open).

Specially because people in Tehran prefer to have late supper compared to North Americans, it was a lot easier to find food options late at night than say in Toronto where past mid-night the only option is fast-foods.