Obvious sign: If the lady taking your order is too nice.
The meaner the cashier, the BETTER the food.
I want the middle-aged auntie with lunch lady arms......who never looks at you. She looking down with the pen and pad taking your order.
Also, the restaurant must have the following:
- Cash only, NO debit cards
- A sign in the window that says "No ticket, no food"
- The cooking area is not visible at all
- Crappy parking
If you come across this, you KNOW the food is banging.