Sauté the onion, leek, celery, and garlic in the olive oil and butter.
Add the white wine (if using) and let it reduce.
Add the crushed tomatoes, stock, and Parmesan rind.
Bring to a simmer and add the tortellini.
Once the tortellini is cooked, stir in the heavy cream and chicken.
Add the kale and season with salt and red pepper flakes (if using).
Garnish with shaved Parmesan and basil.
