Spinach Tortellini Soup

Instructions

1. In a large pot over medium heat, heat oil. Add shallot, Parmesan rind, and 1 teaspoon salt. Cook, stirring often, until shallot begins to brown, 3 to 5 minutes.
2. Add tomato paste, red pepper flakes, thyme, oregano, and ¼ teaspoon pepper and cook, stirring constantly, until colors deepen, about 3 minutes.
3. Add canned tomatoes and cook, stirring occasionally, until thickened and reduced by 1/4, 4 to 6 minutes. Sprinkle Parmesan over and cook, stirring constantly, until fragrant, about 1 minute. Add broth and 1 teaspoon salt if necessary, and bring to a boil. Add tortellini and cook, stirring occasionally to ensure nothing sticks to bottom of pot, until just tender, about 3 minutes. Turn off heat and stir in spinach, lemon zest, and juice.
4. Serve topped with more Parmesan.