Add the onions, and sauté them until they are translucent.
Add the tomatoes, vegetable base, milk, and basil.
Taste and add sugar if necessary.
Simmer on very low heat for about 30 minutes.
Transfer to a blender and puree.
Transfer the soup back to the saucepan, simmer on low.
Add the cream, stir and heat through.
Notes
Quick notes - If you decide to omit the cream, you might want to thicken the soup with a roux. If you can't find crushed tomatoes, whole ones are just fine. Use an immersion blender if you do not have a regular blender.Variations - You can omit the cream and use more milk, or you can omit the cream and serve the soup with a dollop of sour cream.
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