its really good, I discovered it at a restaurant in NYC called Augustine
I make it with a New York Strip and use about 60-40 coriander to pepper but by weight I suspect it is closer to 50-50. The coriander is lighter and takes up more space in my Tablespoon whereas the ground pepper is denser.
I use whole black peppercorns and coriander seeds. Toast them in a pan and then grind in my coffee grinder I use to grind spices. Mix the two together and apply liberally to the steak (after salting the steak).
I made it last night, I should have taken a picture but I was so hungry I couldn't wait to devour it and forgot
bad picture from Augustines: