Method
1. Place rigatoni pasta on a clean large mixing bowl
2. Add water to the pasta and cover
3. Let rest - 10 min
4. Heat olive oil to a clean large cast iron skillet
5. Add onion and fry until softened
6. Stir portobello mushroom, button mushroom, olive oil and garlic clove into the large cast iron skillet
7. Drain pasta
8. Transfer pasta to slow cooker bowl
9. Fry vegetables until lightly browned
10. Transfer fried vegetables to slow cooker bowl and cover
11. Stir in canned chopped tomatoes, vegetable stock, tomato paste, rosemary and tomato to the slow cooker bowl
12. Season with salt & pepper
13. Cook in slow cooker until tender - 2 hr 30 min, low heat
14. Garnish with parmesan cheese lightly
15. Serve with a green salad