Slow-Cooked Beef and Mushroom Braciole

Ingredients

• 1 beef Flank Steak (1-1/2 to 2 pounds)
• 1 cup finely diced mushrooms
• 1/2 cup finely diced onion
• 1/2 cup grated Parmesan cheese
• 2 slices bacon or prosciutto, chopped (about 1 ounce)
• 1 can (28 ounces) crushed tomatoes
• 1 tablespoon Italian seasoning blend
• 1 teaspoon salt, divided
• 1 teaspoon pepper, divided
• 2 cups cooked polenta, warmed