Headquarters in Cape Town's Heritage Square is a steak restaurant fashioned after Paris's Le Relais de l'Entrecôte. The concept of both restaurants is that they serve a set starter and then for the main course only steak and chips, completing the meal with a variety of desserts from which one can choose.
Headquarters in particular serves only (extremely tender) sirloin steak with Mac Donalds-style razor-thin chips. Although they have a vegetarian option, it wouldn't make sense for vegetarians to visit - they really do specialise in steak.
A tip that I can offer is to try visiting HQ (map) at some time other than Friday and Saturday nights. They tend to get very busy around those times and things do get a little hectic in this long room. Also, we found our steak was much better on a Saturday afternoon when things weren't quite as rushed. As you can see from the photo, the restaurant is pretty quiet on a Saturday afternoon.
Food quality: pretty good, but as stated, the steak is better when it's quieter.
Atmosphere: stylish, modern and trendy.
Value for money: averagely-priced for restaurants in a similar class.