Just Cooking
Master Chef
Actually, brown sugar gets hard because the moisture evaporates from it. I have this cute little clay bear that I add to a canister of hard brown sugar. You wet it down, let it absorb the moisture, then put it into the canister. The next day your brown sugar is soft as can be. You don't need a cute clay bear, however, as a piece of moist bread will do the same thing.
I keep brown and powered sugar, along with panko and a few other pantry items vacuum packed.. Works for me...
Ross