Add bacon grease to a large pot over medium high heat. When heated, add first 4 ingredients and cook for 15 minutes, stirring occasionally, until vegetables are soft and the volume has been reduced by one half.
Add remaining ingredients, except tortellini, cover and bring to a boil.
Remove cover and stir. Add tortelloni. Reduce heat to medium and cover.
Cook covered, stirring occasionally, for 15 minutes, or tortelloni is cooked through and rises to the top.