Tomato Tortellini Soup with Sausage

0 Put the oil in a large pot and place over medium heat. Stir in the onion and cover the pot. Cook 5 minutes, until the onion is softened.
1 Stir in the garlic, oregano and red pepper and cook until the garlic smells fragrant, about 15 seconds. Turn the heat to medium-high. Add the sausage, stirring and breaking it up with a spoon. Cook 15 minutes, stirring frequently, until the sausage meat is no longer pink. Add the tomato paste and stir it into the meat.
2 Add the broth, tomato puree, sun-dried tomatoes and 1 teaspoon salt. If you have a Parmesan rind, toss it into the pot. Stir and bring to a simmer. Cook 15 minutes. Keep your eye on the soup and lower the heat if it starts to boil. 
3 Stir in the tortellini and kale. Simmer the soup about 3-5 more minutes, until the tortellini are tender and the kale is wilted and bright green. Remove from the heat and stir in the Parmesan cheese. If you added a Parmesan rind, scoop it out and discard.
4 Serve the soup in bowls, with additional cheese on the side.