Sauté the garlic and onions in a little olive oil over low-medium heat until the onions begin to soften.
Stir in tomatoes (crushing them as you go), broth, milk and lower to a simmer – don’t let the milk boil heavily! Add sugar and continue simmering on low for at least 15 minutes. I had added some basil here, but prefer to add it all towards the end since fresh basil loses its flavor as it cooks.
For a very smooth soup, use an immersion blender at this point.**
Add salt and pepper to taste – it doesn’t need much at all! If your soup is too acidic, try adding a little more sugar and/or milk. Stir in basil and ravioli, and cook per the time indicated on the tortellini package until they’re just about done. Do not overcook otherwise you’ll have mushy tortellini! Al dente is fine, as everything tends to cook a bit more after you turn off the heat.
And that’s it! Serve garnished with any remaining basil.