In a medium pot, heat the olive oil over medium-high heat. Add the finely diced onions and minced garlic, cooking for about 4-5 minutes until the onions become soft and translucent.
Add in the tomato paste and let it cook for 1 minute, stirring continuously to meld its intense flavor with the sautéed vegetables.
Pour in the chicken stock, diced tomatoes, sugar, Italian seasoning, salt, and black pepper. Bring this mixture to a boil before reducing it to a simmer. Allow it to cook gently for 15-20 minutes so that all of those lovely flavors can combine beautifully.
Stir in the heavy cream during the last two minutes of cooking, allowing it to warm through and create that luscious creamy texture.
Once your Easy Ravioli Sauce is ready, serve it generously over your cooked ravioli or any pasta of choice.