The prices are amazingly cheap, perhaps the cheape...

The prices are amazingly cheap, perhaps the cheapest meals you can find in Abuja, which means you don't pay for service. Avoid lunch hour or else you will be standing on the queue for almost 30 mins before you get served.
You pick a bowl in front and wipe then place your food orders.
Be firm and decisive though, thier staff lack any customer training and don't speak much English.