I was at the Brazilian market a few months ago and I came across panela I was exited to figure out what it is and how to use it. Turns out its just unrefined cane sugar. Sometimes its packaged as brown sugar or natural brown sugar, but it differs from the brown sugar in the Dominos box. Panela is the cane sugar before is further processed out into white sugar and molasses. It tastes a little less sweet than packaged brown sugar, with a much deeper instense molasses flavor.
It took some work to crack it open and then cut or shave off some of the sugar, but it was worth it. I used some in place of brown sugar in Indian Pudding. It was awesome!