Stir in tomato paste and cook for an additional minute to deepen the flavor.
Pour in chicken stock and diced tomatoes; add sugar, Italian seasoning, salt, and black pepper. Bring to a boil, then reduce heat to simmer for 15-20 minutes.
After simmering, stir in heavy cream and cook for another 2 minutes until creamy.
Serve over cooked ravioli or any pasta of your choice.