Key takeaways
- 1.5 kg ripe tomatoes, halved
- 1 large yellow onion, cut into wedges
- 5 garlic cloves, left in their skins
- 2 tablespoons olive oil
- 1 teaspoon fine salt, plus more to taste
- ½ teaspoon freshly ground black pepper
- 1 teaspoon dried oregano or 2 tablespoons fresh basil
- 500–750 ml vegetable or chicken stock
- 1 teaspoon sugar, optional
- 60 ml cream, optional
- 1 tablespoon balsamic vinegar, optional
For a rich roasted tomato soup recipe, roast ripe tomatoes at 220°C (425°F) for 35–45 minutes, then blend them with softened aromatics and enough stock to reach your preferred consistency.
Ingredients for Roasted Tomato Soup
- 1.5 kg ripe tomatoes, halved
- 1 large yellow onion, cut into wedges
- 5 garlic cloves, left in their skins
- 2 tablespoons olive oil
- 1 teaspoon fine salt, plus more to taste
- ½ teaspoon freshly ground black pepper
- 1 teaspoon dried oregano or 2 tablespoons fresh basil
- 500–750 ml vegetable or chicken stock
- 1 teaspoon sugar, optional
- 60 ml cream, optional
- 1 tablespoon balsamic vinegar, optional
How to Make Roasted Tomato Soup
1. Prepare the vegetables
Heat the oven to 220°C (425°F). Arrange the tomatoes cut-side up on a large rimmed baking tray. Add the onion wedges and garlic, then drizzle everything with olive oil. Sprinkle with salt, pepper, and oregano.
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Use a tray large enough to leave a little space between the vegetables. Crowding traps steam, which makes the tomatoes soft and watery rather than deeply browned. If necessary, divide the vegetables between two trays.
2. Roast until the edges caramelize
Roast for 35–45 minutes, checking after 30 minutes. The tomatoes are ready when their edges are browned, their skins are wrinkled, and some of their juices have evaporated. The onions should be tender with golden edges, while the garlic should feel soft inside its skin.
For more concentrated flavor, roast for 50–60 minutes at 200°C (400°F). The lower temperature gives moisture more time to evaporate without burning the garlic. Avoid roasting much beyond 60 minutes unless the tomatoes are unusually watery, because scorched tomato skin can make the soup bitter.
3. Blend with stock
Remove the garlic from its skins and transfer the roasted vegetables and tray juices to a blender or large saucepan. Add 500 ml of warm stock and blend until smooth. A countertop blender usually produces the silkiest texture, but an immersion blender works well directly in the saucepan.
Add more stock in 50 ml increments until the soup reaches the consistency you want. Warm the blended soup gently for 5–10 minutes, then taste it. Add the optional sugar if the tomatoes taste sharply acidic, and add balsamic vinegar for extra depth rather than sweetness.
4. Finish and serve
Stir in the cream, if using, after reducing the heat. Do not boil the soup once cream has been added. Adjust the salt, pepper, and acidity, then serve with basil, croutons, grated Parmesan, or grilled cheese.
How Roasting Time and Temperature Change the Soup
Roasting is not just a preliminary cooking step: it determines how sweet, thick, and concentrated the finished soup will be. Heat drives water out of the tomatoes and encourages browning on their exposed surfaces. More evaporation means a thicker soup, while more browning creates deeper savory and caramelized notes.
| Oven setting | Approximate time | Result | Best choice when |
|---|---|---|---|
| 190°C / 375°F | 50–65 minutes | Soft, mellow tomatoes with moderate browning | You want a gentle flavor or are using delicate garlic |
| 200°C / 400°F | 45–60 minutes | Balanced sweetness, evaporation, and caramelization | You want a thicker soup without dark edges |
| 220°C / 425°F | 35–45 minutes | Brighter roasted flavor and browned tomato edges | You want the fastest rich result |
| 230°C / 450°F | 25–35 minutes | Fast browning, but a higher risk of burnt garlic or bitter skin | Your tomatoes are very juicy and cut into small pieces |
Choosing the Right Roast for Your Tomatoes
- Firm, watery tomatoes: Use 220°C (425°F) for about 45 minutes. The higher heat encourages faster evaporation and prevents a thin final soup.
- Very ripe or soft tomatoes: Use 200°C (400°F) for 40–50 minutes. They already contain concentrated flavor, so moderate heat reduces the risk of burning.
- Cherry tomatoes: Roast at 220°C (425°F) for 25–35 minutes. Their small size means they caramelize quickly.
- Large beefsteak tomatoes: Cut them into quarters or thick wedges. Roast at 200–220°C (400–425°F) for 45–60 minutes so the centers cook before the edges darken.
- Canned tomatoes: Drain them well and roast at 220°C (425°F) for 25–35 minutes. They generally need less time because they are already peeled and processed.
Use the Tray to Control Final Consistency
The amount of stock is only half of the consistency equation. The other half is how much moisture the tomatoes lose in the oven.
As a practical starting point, 1.5 kg of fresh tomatoes usually produces approximately 900–1,100 g of roasted vegetables after evaporation. Adding 500 ml of stock creates a thick, spoon-coating soup. Adding 750 ml produces a lighter soup suitable for a mug or first course.
For a simple adjustment, begin with 500 ml stock and blend. If the soup is too thick, add 50 ml at a time. If it is too thin, simmer it uncovered for 5–15 minutes. This is more reliable than adding all the stock at once because different tomatoes can lose very different amounts of water.
Texture Choices: Smooth or Rustic
For a completely smooth soup, blend for 60–90 seconds in a high-powered blender, then pass it through a fine sieve if tomato seeds or skins remain noticeable. This produces a restaurant-style texture but removes some pulp.
For a rustic soup, pulse the roasted vegetables briefly or use an immersion blender for 20–30 seconds. Leave some small pieces of onion and tomato for texture. If using a countertop blender, remove the center cap from the lid and cover the opening with a folded kitchen towel. Hot soup expands as it blends, so never seal a full container completely.
Troubleshooting a Roasted Tomato Soup
The soup tastes thin
First check whether the roasting tray was crowded. If it was, the vegetables probably steamed. Simmer the blended soup uncovered until it thickens, or roast a second batch of tomatoes for 20–30 minutes and blend them in. Adding flour is usually unnecessary and can dull the tomato flavor.
The soup tastes sour
Acidity varies by tomato variety and ripeness. Add a small pinch of sugar, about ¼ teaspoon at a time, then taste. A spoonful of cream or a drizzle of olive oil also softens sharp acidity. Add salt before adding much sugar, since under-seasoning can make sourness seem stronger.
The soup tastes bitter
Likely causes include blackened garlic, severely charred tomato skin, or excessive balsamic vinegar. Remove any visibly burnt pieces before blending. If the bitterness is mild, dilute the soup with stock and balance it with cream or a small amount of sugar.
The soup is too thick
Whisk in warm stock, water, or milk 50 ml at a time. Reheat gently after each addition, since a soup can appear thicker when cold than it will be at serving temperature.
Make-Ahead, Storage, and Reheating
Roasted tomato soup keeps in a covered container in the refrigerator for up to four days. Cool it promptly before refrigerating. Reheat over medium-low heat, stirring occasionally; vigorous boiling can make the flavor taste flatter and may cause cream to separate.
For longer storage, freeze the soup without cream for up to three months. Thaw it in the refrigerator overnight, reheat gently, and add cream only after the soup is hot. Freezing the dairy separately helps preserve the smoothest texture.
Serving Ideas
Serve the soup with toasted sourdough, grilled cheese, garlic croutons, or a spoonful of plain yogurt. Fresh basil adds brightness, while chili flakes provide heat without changing the soup’s basic balance. For a more substantial dinner, add white beans, cooked pasta, or shredded roast chicken after blending.
The most dependable approach is to roast at 220°C (425°F) until the tomato edges brown, start blending with less stock than you think you need, and adjust the liquid only after tasting the finished base. That combination gives you control over sweetness, texture, and consistency in every batch.
