Preheat oven to 350 degrees. Heat oil and butter in a large ovenproof Dutch oven over medium heat. Add onion and garlic; cook, stirring occasionally, until softened, 6 to 8 minutes. Add mushrooms. Raise heat to medium-high, and cook, stirring occasionally, until mushrooms are softened, about 5 minutes. Stir in all of the grains. Cook, stirring often, 12 minutes. Stir in stock; bring to a boil.

Cover, and transfer to oven. Bake until grains are tender, 40 to 50 minutes (check after 40 minutes, but don't remove lid before then). Season with salt and pepper. Serve immediately.

Add grains, and stir well, coating them with oil. Cook, stirring often, for about 10 to 15 minutes. Stir in stock, and bring to a boil. Cover pot, and put in oven. Bake for 30 to 40 minutes (check after 30 minutes; remove lid and cook a little longer if grains need to be softer). Fold in chopped herbs. Drizzle with Marsala wine. Season with salt and pepper, and serve immediately.

To reheat: Place the pilaf mixture in a buttered, ovenproof casserole. Do not fold in the herbs or add Marsala. Cover, and refrigerate until ready to serve. When ready to serve, bring the pilaf to room temperature, about 20 minutes. Heat the oven to 350 degrees. Drizzle with Marsala. Cut a piece of parchment paper to fit the top of the casserole, and butter it. Place the parchment on the pilaf, butter-side down. Place in the oven until heated through, about 30 minutes.