Choose plain tomatoes.
Use crushed tomatoes without added herbs or chili so the seasoning stays predictable.
Find a recipe A smooth tomato soup made from canned tomatoes, softened onion and a little cream. A small pot and an immersion blender keep the process straightforward.

Recipe draft · Reviewed editorially, not kitchen tested by us. Prep: about 10 minutes. Cooking: about 30 minutes. Times vary with equipment and ingredient size. Contains milk. Check broth and canned tomato labels for other allergens.
Heat the oil in the pot over medium low heat. Add the onion and cook for about 8 minutes, stirring. Add the garlic for the final 30 seconds.
The onion should soften without dark browning. Lower the heat if it catches.
Add tomatoes, broth and pepper. Bring to a simmer, then partially cover and cook gently for about 20 minutes, stirring occasionally.
A quiet simmer is enough. Reduce the heat if thick tomato bubbles spit out of the pot.
Remove the pot from the heat and allow bubbling to stop. Follow the immersion blender instructions for hot liquids. Keep the blade guard submerged while blending, and switch off before lifting it.
Hot soup can splash. Use a deep pot and keep hands away from the blade; do not substitute a sealed personal blender.
Stir in the cream, reserving a teaspoon for a swirl if you like. If too thick, add water a tablespoon at a time. Warm gently if needed, then taste and add salt.
Aim for soup that pours easily from a ladle. Do not boil vigorously after adding cream.
Divide into four bowls. Add the reserved cream and optional basil. Let each bowl cool to a comfortable eating temperature.
This makes four small bowls; bread or another side makes a fuller meal and is extra.
Use crushed tomatoes without added herbs or chili so the seasoning stays predictable.
Canned tomatoes and broth vary in salt. Adjust after the soup has simmered.
An immersion blender avoids transferring hot soup. Follow your appliance manual for safe use.
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