Over medium heat, melt butter and add turkey with a dash or two of salt. Saute until the turkey is browned and little pink remains.
Add diced onion, garlic, peppers and riced cauliflower, until softened, about 5 minutes.
Add fresh herbs and saute until fragrant, about 2 minutes.
Add tomato sauce and broth, stirring well. Bring to a boil and then lower to a simmer. Taste for salt & pepper, and add accordingly.
Place parmesan rind in the pot while the soup simmers for about 20-25 minutes.
Remove parmesan rind, serve with grated parmesan cheese.