Rough chop each ingredient (no need to peel tomatoes or potatoes)
Melt butter over medium heat.
Add the onion.
Once the onion is translucent, add the tomatoes, potatoes, mushrooms and cook (stirring frequently) for 5 minutes.
Add broth, parmesan cheese rind and sausage.
Add salt, pepper, garlic powder to taste along with any other preferred herbs.
Bring to a simmer and cover.
Cook, stirring occasionally for 45 minutes.
While the stew is cooking, prepare rice.
After the 45 minutes, stir in the spinach and cook gently until wilted.
Serve over rice with freshly grated parmesan cheese.