Brush the insides of the squash halves with olive oil, and season with salt and pepper.
Place squash on a baking sheet and roast in preheated oven for 20 minutes.
Meanwhile, in a medium saucepan, combine farro and vegetable broth. Bring to a boil, reduce heat, and simmer for 20 minutes or until farro is tender.
In a medium skillet, heat olive oil over medium heat. Add onions and garlic, and cook until softened, about 5 minutes. Add rosemary and thyme, and cook for 2 minutes more.
Stir the cooked farro and onion mixture together, and season with salt and pepper to taste.
Remove squash from oven, and fill each half with the farro mixture. Sprinkle with Parmesan cheese.
Return to oven and roast for an additional 15 minutes, until cheese is melted and bubbly.
Serve warm.
Interesting Facts
Farro is an ancient form of wheat, packed with nutrition.
Roasted acorn squash is a delicious and nutritious vegetable.