Side note: if you have brown sugar that has turned into a rock, you can put it in the oven on a low temp and it will soften (it melts the molasses).
I do this if I need a lot of it, but admittedly if I just need a couple of spoonfuls for BBQ sauce or something, I beat it with a hammer or against the counter and toss a chunk in the pot. It'll melt as the sauce cooks. 😂