Roasted Tomato Soup Recipe
Smooth tomato soup made with oven-roasted tomatoes, red pepper, onion, and garlic, then finished with milk.
Keep the Roast Deep, Not Bitter
Arrange the vegetables in a single layer so they roast rather than steam, and save every flavorful pan juice for the pot. Roast until the tomatoes soften and the edges develop color, but remove completely blackened skins and prevent the garlic from burning. A light flour roux adds body, while adding the milk over low heat keeps the finished soup velvety without making it heavy.
- Yield
- Approximately 1.5 liters of soup
- Servings
- 6 servings
- Total time
- 1 hr 15 min
- Difficulty
- Easy
- Prep time
- 20 min
- Cook time
- 55 min
Ingredients for Roasted Tomato Soup
VEGETABLES TO ROAST
FOR THE SOUP
How to Make Roasted Tomato Soup
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01
Prepare the vegetables for roasting
10 minutesPreheat the oven to 200°C with both top and bottom heat. Wash the tomatoes, remove the tough stem end, and halve them. Halve the red peppers lengthwise and remove the seeds. Peel and quarter the onion, leaving the garlic cloves in their skins. Arrange the vegetables in a single layer on a large baking sheet. Drizzle with the olive oil, then sprinkle evenly with half the salt, the black pepper, and the thyme.
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02
Roast the vegetables carefully
40 minutesPlace the baking sheet on the upper-middle rack of the preheated oven. Roast the vegetables for about 40 minutes, until the tomatoes are noticeably softened and their juices have concentrated, and the onion edges and pepper skin are darkened in places. If the garlic starts to brown early, move it to a cooler corner of the baking sheet. Do not discard the vegetable juices collected on the sheet.
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03
Remove the dark skins
5 minutesRemove the baking sheet from the oven. Squeeze the garlic cloves from their skins. Peel the completely blackened outer skin from the red peppers where it comes away easily. Remove any very dark, hardened, loose pieces of tomato skin. Keep the lightly browned surfaces. Let the vegetables rest together with all the flavorful juices from the baking sheet.
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04
Make a light roux
3 minutesMelt the butter in a medium saucepan over medium-low heat. Add the flour and cook, stirring constantly, for about 1 minute, until the raw flour smell disappears but before the flour begins to brown. Add the tomato paste and stir for 1–2 minutes more to cook out its raw smell.
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05
Blend the soup until smooth
10 minutesAdd the roasted vegetables and all the liquid from the baking sheet to the pot. Add the first 3 cups of hot water. Remove the pot from the heat briefly, then blend with an immersion blender until completely smooth. Add the remaining hot water as needed to adjust the consistency; using all of it yields a soup of about medium thickness. Return the pot to medium heat and simmer gently for 8–10 minutes.
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06
Adjust the final consistency with milk
2 minutesReduce the heat. Slowly pour in the milk at room temperature, stirring the soup constantly. Add the remaining salt and taste. After adding the milk, do not bring the soup to a vigorous boil; stir for only 1–2 minutes, until heated through again. If needed, thin the soup with a few tablespoons of hot water.
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07
Serve hot
2 minutesRemove the soup from the heat and ladle it into bowls. Serve hot so the roasted flavor and smooth texture remain pronounced. You can serve it with plain toast or a grilled cheese sandwich; these serving items are excluded from the base recipe and nutrition calculation.
Mastery Guide
Review the technical details, common mistakes and correct practices that determine the recipe result.
Critical Tips
Roast the vegetables in a single layer
Vegetables piled on the baking sheet will steam instead of roast, weakening the true roasted flavor.
Best practice: Use a large baking sheet and arrange the tomatoes, peppers, onion, and garlic in a single layer whenever possible.
Save the liquid from the baking sheet
The concentrated liquid released by the tomatoes in the oven adds both flavor and natural body.
Best practice: Transfer the roasted vegetables to the pot along with all the flavorful liquid left on the baking sheet.
Distinguish charred skin from roasted marks
Light brown to dark roasted marks add flavor, while completely black, tough skin can make the soup bitter.
Best practice: Remove completely charred, loose pepper and tomato skins, but keep lightly browned surfaces.
Add the Milk at the End
The acidity of the tomatoes and high heat can affect the milk proteins.
Best practice: Add the milk at room temperature over low heat, stirring constantly; do not bring it to a vigorous boil.
Common Mistakes
Overcrowding the Baking Sheet
The vegetables will soften in their own steam, brown less on the surface, and lose some of their roasted flavor.
Best practice: Spread the vegetables in a single layer; if your baking sheet is small, divide them between two sheets.
Overbrowning the Flour
Darkly toasted flour can overpower the tomatoes' bright flavor and give the soup a heavy, overly toasted taste.
Best practice: Toast the flour over light heat for approximately 1 minute, just until the raw smell disappears.
Using Too Much Tomato Paste
Too much tomato paste can mask the fresh roasted tomato flavor and make the soup taste more like tomato-paste soup.
Best practice: For 1 kg tomatoes, use 1 teaspoon tomato paste as a supporting amount.
Boiling the Milk Too Vigorously
Boiling milk for too long in an acidic tomato base can cause curdling and surface separation.
Best practice: Add the milk last over low heat, and keep the soup on the heat only long enough to reheat it.
Why Does This Happen?
Why Does Roasting Intensify the Tomato Flavor?
As some of the water evaporates in the oven, the vegetables' natural sugars and aromatic compounds become more concentrated; controlled browning on the surface adds depth of flavor.
Best practice: Do not remove the tomatoes while they are still watery; wait until the edges develop a little color.
Why Does the Soup Taste Bitter?
Completely burnt pepper skin, garlic, or very darkly toasted flour can add bitterness.
Best practice: Remove the charred skins, do not let the garlic burn, and keep the roux light in color.
Why Is the Soup Too Thick?
The vegetables lose water during roasting, while the flour thickens the liquid; if the tomatoes have low water content, the soup will be thicker with the same amount of liquid.
Best practice: Add the hot water gradually during the final 1 cup, adjusting the pouring consistency.
Why Can Milk Curdle When Added?
Adding very cold milk all at once to a boiling, acidic tomato base can disrupt the proteins.
Best practice: Bring the milk close to room temperature, reduce the heat, and add it in a thin stream while stirring.
Mayana Tips
Use Ripe Tomatoes
Roasting intensifies the flavor, but it cannot fully make up for raw, firm, flavorless tomatoes.
Best practice: Choose fragrant, red, ripe, meaty tomatoes; varieties that are not too watery give the soup a fuller body.
Roast the Vegetables Ahead
Roasting is the longest step and should be done close to serving time.
Best practice: Roast the vegetables 1 day ahead and refrigerate them in a covered container with the juices from the baking sheet; finish the soup on the day you serve it.
Keep the Serving Oil Light
Because the recipe already contains olive oil and butter, adding too much oil on top can mask the roasted flavor.
Best practice: Serve it plain, or use only a little fresh thyme, basil, or finely grated kashar cheese.
Adjust the Acidity at the End
The tomatoes' acidity changes noticeably after roasting and adding the milk.
Best practice: Do not automatically add sugar at the beginning; if the soup still tastes too sharp after adding the milk, make the final adjustment with only a small pinch of sugar.
Ingredients & Measurements
Maintain the Tomato-to-Liquid Ratio
Adding too much water to 1 kg tomatoes for roasting dilutes the soup's roasted character.
Best practice: Add 600 ml hot water at the beginning, then add the remaining 200 ml according to the consistency after blending.
Use Only Enough Flour to Support the Soup
Roasted vegetables already provide natural body; too much flour makes the soup unnecessarily thick and gives it a floury taste.
Best practice: For 1 kg tomatoes, 1 level tablespoon, approximately 10 g, of flour is enough.
Use Kapya Pepper in Moderation
Kapya pepper adds natural sweetness and roasted flavor; using too much shifts the recipe away from the tomatoes.
Best practice: For 1 kg tomatoes, use 1 large kapya pepper to keep the tomatoes as the main flavor.
Do Not Turn the Milk into Cream
Too much milk or cream can soften the smoky flavor while masking the tomato flavor.
Best practice: For this 6-serving recipe, use 100 ml milk only to round out the acidity and improve the mouthfeel.
Cooking Techniques
Roast Carefully at 200°C
The medium-high oven temperature is enough to brown the surface without drying out the vegetables.
Best practice: Use 200°C with both top and bottom heat, and check the tenderness and surface color together at about the 40-minute mark.
Keep the Roux Light
Distributing the starch through the fat is enough to thicken the soup; a dark roux does not suit this recipe's fresh tomato character.
Best practice: Stir the butter and flour over medium-low heat for about 1 minute, then add the tomato paste.
Use the Immersion Blender Off the Heat
Blending the boiling soup vigorously increases the risk of hot splashes.
Best practice: Remove the pot from the heat briefly, keep the blender head submerged in the liquid, and blend until smooth before returning the pot to the heat.
Simmer Briefly After Blending
A brief, gentle simmer is enough to meld the flavors of the puréed vegetables and roux.
Best practice: After blending, simmer the soup gently over medium-low heat for 8–10 minutes; do not cook it unnecessarily long.
How to Store and Make Roasted Tomato Soup Ahead
- Serving temperature
Serve hot; after removing the soup from the heat, let it stand briefly and serve it at a comfortable drinking temperature.
- Best resting time
Letting the soup stand for 5 minutes after removing it from the heat helps the surface bubbles settle and the texture look more even; this is optional.
- Refrigerator storage
Once completely cool, store the soup in a covered container at 0–4°C for no more than 3 days. For the best flavor and texture, eat it within the first 2 days.
- Room-temperature limit
Do not leave the soup at room temperature for more than 2 hours outside serving time; keep it out for less time in very hot conditions.
- Freezing
Because the milk may separate slightly when thawed, the best result comes from freezing the soup base before adding the milk. The milk-free base can be frozen in a covered container for up to approximately 2 months.
- Thawing method
Thaw the frozen milk-free soup base in the refrigerator. Heat it thoroughly in a pot, then add the milk over low heat and adjust the texture.
- Reheating
Reheat refrigerated soup over medium-low heat, stirring occasionally, until completely hot; do not bring milk-based soup to a strong boil for an extended time.
- Make-ahead steps
You can roast the tomatoes, red pepper, onion, and garlic 1 day ahead and refrigerate them with the pan juices in a covered container. Complete the roux, blending, and milk-adding steps on the day of serving.
- Serving suggestion
Ladle into warm bowls. If desired, serve with toast or grilled cheese; use rich, oily garnishes sparingly.
Nutrition
1 serving: 1/6 of the recipe; including serving additions
Calculated approximately using standard product nutrition values and common household-measure conversions for 1/6 of the recipe. Values are approximate calculations.
Frequently Asked Questions About Roasted Tomato Soup
Should you peel the tomatoes for roasted tomato soup?
You do not have to peel all of them. A powerful immersion blender can break down thin skins, but removing skins that are completely blackened, hardened, or already coming loose gives a smoother, less bitter result.
Is red pointed pepper essential in roasted tomato soup?
No, but red pointed pepper enhances the smoky flavor and natural sweetness. If you leave it out, add 1 medium tomato to preserve the soup's vegetable body.
Can you use cream instead of milk in roasted tomato soup?
Yes. For a richer result, you can add about 80 ml heavy cream instead of 100 ml milk. Stir in the cream over low heat at the end, and do not boil the soup for a long time.
Why does roasted tomato soup taste sour?
Unripe tomatoes, insufficient roasting, or very high tomato acidity can make the sour taste more pronounced. First, brown the vegetables sufficiently and add the milk; if the finished soup still tastes sharp, balance it with only a small pinch of sugar.
Can you make roasted tomato soup without flour?
Yes. If you leave out the flour, start by reducing the hot water by approximately 100–150 ml, or boil the soup for a few extra minutes after blending so it thickens from the vegetables’ natural body.
Can roasted tomato soup be frozen?
For the best texture, freeze the soup before adding the milk. Thaw it in the refrigerator and reheat it in a pot, then add fresh milk to help reduce the chance of the milk separating after thawing.
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