Stopped here because of the diverse menu. My server recommended the lobster roll and I was not disappointed. Great place and service.

another place that looks more like a posh fast food place rather than a restaurant.
However the menu was different to other outlets in the square and the food and service were good.
well worth a visit

There are ten restaurants in Nelson Mandela Square and judging by the huge menu and how crowded it was you might think it is a fast food joint. It is not. They serve excellent food and wine quite quickly and efficiently with a smile and at a very reasonable price. We were only in the adjacent hotel for one night and were delighted to have had dinner at Big Mouth.

We took one of our consultants from the UK out for dinner. What an experience! The service was excellent and the food even better. For a place with such immense variety on their menu, every plate was done to perfection. The sushi is super fresh and the steaks awesome. The tables could have been a bit bigger, we were six people at one of the booths and it was slightly tight.

We dined here several times during our recent stay in Johannesburg. Great menu and excellent food. Very large and busy restaurant, but the staff handled things well. No waiting. Good location right on Nelson Mandela Square.