Cook Sausage and Vegetables
Begin by heating a large, heavy-bottomed pot over medium-high heat. Add the Italian sausage, breaking it into bite-sized pieces with a wooden spoon. The key here is achieving proper browning—don’t rush this step. Cook for 3-4 minutes until the sausage develops a golden crust, then add the chopped onion and minced garlic. Continue cooking for another 2-3 minutes until the onion becomes translucent and fragrant. This foundation step creates the flavor base that makes restaurant-quality soup at home possible.
Add Liquids and Tomatoes
Whisk in the chicken stock, ensuring you scrape up any browned bits from the bottom of the pot—these caramelized pieces add incredible depth. Add the crushed tomatoes and tomato paste, whisking until the tomato paste completely dissolves. Bring the mixture to a rolling boil, then add the sea salt and reduce heat to maintain a gentle simmer. Allow the soup to cook undisturbed for 15 minutes, letting the flavors marry and intensify.
Add Kale, Tortellini, and Cream
Stir in the torn kale leaves first—they need slightly more time to wilt and become tender. Add the fresh tortellini next, followed by the heavy cream. The cream should be added gradually while stirring to prevent curdling. Cook for 3-5 minutes, until the kale has wilted completely and the tortellini floats to the surface, indicating they’re perfectly cooked and ready to serve.
Serve with Style
Ladle the hot soup into warmed bowls for the best presentation. Top each serving with freshly grated Parmesan cheese and a light sprinkle of red pepper flakes for those who enjoy a subtle heat. Serve immediately with crusty bread or garlic breadsticks for a complete Italian-inspired meal.