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Hidden-Veg Tomato Soup

September 20, 2026 · By Kitchen With Mommy Editorial Team

Two white bowls of smooth tomato soup garnished with fresh herbs
Photo: Rawpixel (uncredited) · CC0 1.0 (public domain dedication)
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Carrot, celery, red pepper and onion, cooked down and blended into tomato soup until none of them are detectable as anything other than “tomato soup”. For a child whose objection is to visible or lumpy vegetables — which is most of them — this sidesteps the argument entirely.

One honest note about the name

Blending vegetables into a sauce or soup is a perfectly reasonable thing to do. Announcing it afterwards is not — a triumphant “that had four vegetables in it!” costs you trust at the next meal, and children remember. Our guide to feeding a picky eater goes into why.

Serve it as tomato soup. That is what it is.

Blend it further than you think

The single most important step. A soup that is 95% smooth still has enough texture to be rejected, and you have done the work for nothing. Blend for a full two minutes, and if you want it genuinely silky, push it through a sieve afterwards.

A stick blender straight in the pan is easiest. A jug blender gives a smoother result — fill it no more than halfway with hot liquid, hold the lid down with a folded towel, and start slow. Hot soup in a sealed blender expands and will lift the lid off.

Why the sugar and the long soften matter

Tinned tomatoes are acidic and that acidity is what children read as “too sharp”. Cooking the vegetables slowly for a full ten minutes first draws out their natural sweetness, and a teaspoon of sugar balances the rest. Skip either and the soup tastes thin and sour.

Freezing

It freezes very well. Cool in shallow containers within two hours, then freeze in portions — best quality within two to three months, per standard guidance for soups. Reheat until steaming hot throughout.

Where to go next

Hidden-Veg Tomato Soup

A completely smooth tomato soup carrying carrot, celery, pepper and onion.

Prep15 minutes
Cook30 minutes
Total45 minutes
ServesServes 6

Ingredients

  • 2 tbsp olive oil
  • 1 large onion, roughly chopped
  • 1 large carrot, roughly chopped
  • 1 stick celery, roughly chopped
  • 1 red pepper, deseeded and roughly chopped
  • 2 garlic cloves, sliced
  • 2 x 400g tins chopped tomatoes
  • 500ml vegetable or chicken stock
  • 1 tsp sugar
  • 1 tsp dried oregano or a few fresh basil leaves
  • Salt and pepper

Instructions

  1. Heat the oil in a large saucepan over medium heat.
  2. Add the onion, carrot, celery and red pepper. Cook for a full 10 minutes, stirring now and then, until everything is soft and the onion is translucent. This step builds the sweetness - do not rush it.
  3. Add the garlic and cook for 1 minute more.
  4. Tip in the tomatoes, stock, sugar and oregano. Season with salt and pepper.
  5. Bring to a simmer, then cook uncovered for 20 minutes, until the carrot is completely tender when pressed against the side of the pan.
  6. Blend until completely smooth - a full 2 minutes. With a jug blender, fill it no more than halfway, hold the lid down with a folded towel and start on low.
  7. Taste and adjust the salt. For a silky finish, push it through a sieve.
  8. Serve hot, with bread or a cheese sandwich.

Notes

  • Blend longer than feels necessary. Any remaining texture defeats the point.
  • Never fill a jug blender more than halfway with hot liquid - it expands and can force the lid off.
  • Freeze in portions in shallow containers, cooled within 2 hours. Best quality within 2 to 3 months.
  • Serve it as tomato soup. Announcing the vegetables afterwards tends to backfire.