Low Carb Keto Zuppa Toscana Soup

* 1 lb mild Italian sausage

* 1 bag whole radishes 16 ounces

* 1 medium onion, diced

* 2 teaspoons minced garlic

* 32 ounces chicken or vegetable broth

* ⅓ cup heavy whipping cream

* 2 to 3 cups kale leaves