In a large pot or dutch oven, sauté the onion, celery and carrot for about 5 minutes over medium heat with a pinch of salt.Add the garlic and oregano and continue to sauté for an additional 2 minutes. Add tomatoes and broth and 1 tbsp of salt. Bring to boil then reduce to simmer. Simmer for 30 minutes.
Make the meatballs.
Mix together the ground meat, salt, parmesan and panko. Set aside until the soup is finished simmering. Use a small cookie scoop (any size between 1 and 2 ounces) to scoop the meatball mixture directly from the bowl and drop them into the soup. Once they are all in, simmer the meatball soup for 20 minutes.
Finish the soup.
Add the tortellini and simmer for another 8 minutes. Finish with fresh chopped parsley.