Halve the squash lengthwise peel seed and cut into chunks Place in a soup pot with the broth Simmer partially covered until tender 20 to 25 minutes Transfer the squash to a bowl with a slotted spoon reserve broth Melt the butter in the oil in a nonstick skillet over very low heat Add the onion and cook stirring until wilted about 15 minutes Sprinkle with the mace and ginger Cook stirring for 1 minute more Add the cooked onion mixture and the brown sugar to the squash and stir well Season with salt and pepper