Braaing South African Steak Like The Pro's.The art of cooking a steak to perfection (medium, medium rare or rare)
A 'Safe' way to achieve this is by 'feeling' the meat with your tong's. This meat feel is demonstrated in the diagram below:

'The hotter the fire the better'
Some steak marinades are purposefully high in oil and cause a 'flame up' when the steak is dropped onto the fire. This seals the steak (more flavour and tenderness)
If you are going to serve a steak as a excellent braai starter. Remove it from the fire earlier, allow it to stand for a minute or two, slice into finger pieces and serve on a board (it will 'bleed' while resting and become a 'pink medium')
An add-on trick to this 'tong control' is that if you require a medium to well (burnt offering) you can roll your tongs over the meat while cooking, this effectively bleeds the meat and results in a bloodless or grey(medium) steak quicker (the more time on the heat the tougher the steak)