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Adult Guinea Pig
They are a spiced cookie/cake with currants cooked on a griddle rather than baked in the oven. If you have a recipe for Rock Cakes its virtually the same only a bit wetter so that you can roll out the mixture and cut it into shapes before griddle cooking them.
I haven't heard of rock cakes either. They do sound lovely! When I watch the Great British Baking Show on PBS, I am just fascinated by all of the fancy desserts that are made. I think our desserts here in the US are rather boring as we pretty much have cakes, pies, and cookies. I know there are others, but that is pretty much what is common around here.