It's one of those answers to the 'If you could only carry half a dozen flies...' question. It may have started life as a dry fly, but the Gold Ribbed Hare's Ear makes a very fine nymph. A good early season searching pattern, with a decent tungsten bead it can make its way through the deeper channels and runs where the fish will be lying.
On the RFB tutorial, I am using a Varivas 2120WB hook. The wave barbless has an interesting profile, especially at the point, but I have been impressed by its hooking capability. I have several friends tying their dries on them too.
Keep things simple: A black or gold coloured tungsten bead and I like just three (or so...) turns of the gold rib.
I like to the hare's mask to ensure there are plenty of spikey, buggy guard hairs that give this fly its pulling power.