A good tomato basil soup should taste like tomatoes, not like the can. This version starts by roasting fresh plum tomatoes, onion and garlic at high heat until their edges caramelize, which concentrates their sugars and adds a toasty depth that a straight simmer can't match. The result is a smooth, bright, naturally sweet tomato basil soup that comes together in about an hour.
This recipe makes 6 generous servings, so it works for a family dinner or for portioning into lunches for the week. Fresh basil is added at the end so its aroma stays vivid, and a splash of half-and-half or a dairy-free alternative gives the soup a silky body without making it heavy. Everything is written for a standard home kitchen with a rimmed baking sheet, a medium pot and a countertop or immersion blender.
Full recipe below
Roasted Tomato Basil Soup
Why this roasted tomato basil soup works
Roasting is the key step. Tomatoes contain a lot of water, and simmering them alone can leave a thin, one-note soup. Roasting at 425°F drives off moisture and caramelizes the natural sugars along the edges of the vegetables, so the finished soup tastes richer and more complex. The onion and garlic roast in the same pan, which softens their sharpness and makes the base taste mellow without any extra cooking step.
The soup is built on a short, practical method. You roast for about 30 minutes, simmer briefly with broth to loosen everything, then blend. Because the vegetables are already tender and sweet, you don't need to cook the soup for an hour to get flavor. Using a little tomato paste adds concentrated color and body, and a pinch of sugar is optional if your tomatoes are underripe, which is a common issue outside peak summer.
Ingredients you need and how to choose them
- Plum or Roma tomatoes, 2.5 lb: these have thicker flesh and fewer seeds than slicing tomatoes, so the soup is less watery. Choose tomatoes that smell fragrant and feel heavy for their size. Canned whole tomatoes can be substituted in a pinch, see the notes below.
- Yellow onion, 1 medium: yellow onions have a balanced sweetness that holds up to roasting. Red onions work too but can taste sharper.
- Garlic, 6 cloves: use whole, unpeeled cloves in the pan so they roast softly and don't scorch. Squeeze them out of the skins after roasting.
- Extra-virgin olive oil, 3 tbsp: a good everyday olive oil is fine here because it is roasted rather than used raw.
- Low-sodium vegetable broth, 3 cups: low-sodium broth lets you control the salt. Chicken broth also works if you prefer a savory background.
- Tomato paste, 1 tbsp: concentrates the tomato flavor and deepens the color. Look for a paste in a tube or can with only tomatoes in the ingredient list.
- Fresh basil, 1 cup loosely packed leaves: basil is best fresh and added at the end. Dried basil loses its bright aroma when simmered, so save it for the topping only if you must.
- Half-and-half, 1/2 cup: this adds creaminess without the richness of heavy cream. Use unsweetened oat or cashew milk for a dairy-free version.
- Salt and black pepper: season in stages, since roasted tomatoes and broth both contribute salt.
How to make the soup step by step
- Heat the oven to 425°F and position a rack in the center. Line a rimmed baking sheet with parchment or foil for easy cleanup.
- Halve the tomatoes lengthwise and arrange them cut side up on the sheet with the quartered onion and whole, unpeeled garlic cloves. Drizzle with 3 tbsp olive oil, then sprinkle with 1 tsp salt and 1/2 tsp black pepper. Toss gently so everything is coated, then spread them in a single layer, cut sides up.
- Roast for 30 to 35 minutes, until the tomatoes have collapsed, the edges are browned in spots and the garlic is soft. Taking the time to get some color on the tomatoes is what gives the soup its depth.
- While the vegetables roast, warm a splash of oil in a large pot over medium heat if you like, or start the soup directly once the pan comes out of the oven. Let the roasted vegetables cool for 5 minutes so they are safe to handle.
- Squeeze the soft garlic out of its skins into the pot. Scrape the tomatoes, onion and any browned bits from the pan into the pot, adding the juices too.
- Stir in the tomato paste and 3 cups of broth. Bring the mixture to a gentle simmer over medium heat and cook for 10 minutes so the flavors meld.
- Remove the pot from the heat. Add most of the basil, reserving a few leaves for garnish, and blend until smooth with an immersion blender, or work in batches in a countertop blender with the lid vented.
- Return the soup to low heat if it needs warming, stir in the half-and-half and adjust salt and pepper to taste. Keep the soup warm but avoid a hard boil after adding dairy.
- Ladle into bowls, top with the reserved basil leaves and a drizzle of olive oil, and serve hot.
Storage and reheating your tomato basil soup
Let the soup cool to room temperature for no more than 2 hours, then refrigerate it in airtight containers. FoodSafety.gov's cold storage guidance recommends eating refrigerated leftovers within 3 to 4 days. The soup keeps well, and the flavor often improves by the next day as the basil and garlic mellow.
To freeze, portion the soup into freezer-safe containers and leave about 1 inch of headspace for expansion. Freeze without the half-and-half if you can, then stir it in after reheating, since dairy can separate slightly after freezing. Frozen soup keeps for about 3 months.
Reheat on the stove over medium-low heat, stirring often, until the soup is steaming hot throughout. If you added dairy, avoid a rolling boil. Thin with a splash of broth or water if the soup has thickened in the fridge, and add fresh basil after reheating for the brightest flavor.
Common mistakes to avoid with tomato basil soup
- Skipping the roast: tossing raw tomatoes into a pot produces a flat, watery soup. Roasting is the step that makes this version taste deep and sweet.
- Overcrowding the pan: if the tomatoes are piled up, they steam instead of caramelizing. Use two sheets if necessary.
- Adding basil too early: simmering basil dulls its flavor and turns it dark. Stir in most of it after blending and garnish with the rest.
- Boiling after adding dairy: a hard boil can cause half-and-half to curdle or separate. Warm it gently over low heat.
- Under-seasoning: roasted tomatoes need salt to taste fully bright. Taste the finished soup and adjust before serving.
- Blending hot liquid in a full blender: heat builds up pressure. Fill the jar no more than halfway, remove the center cap and cover with a towel.
Swaps and variations, including a lighter option
- Lighter version: replace the half-and-half with 1/2 cup of unsweetened plain Greek yogurt stirred in off the heat, or skip the cream entirely. This keeps the soup creamy-looking while reducing saturated fat.
- Dairy-free: use full-fat coconut milk or unsweetened oat milk. Coconut adds a subtle sweetness that pairs well with roasted tomatoes.
- Canned tomato option: use two 28 oz cans of whole peeled tomatoes, drained slightly, and roast them the same way for 25 minutes. Canned tomatoes are a practical choice in winter.
- Extra vegetables: add a roasted red bell pepper or a couple of carrots to the pan for more body and sweetness.
- Spicy version: add a pinch of red pepper flakes with the garlic, or finish each bowl with a few drops of chili oil.
- Grilled cheese pairing: keep the soup as is and serve it with a sharp cheddar sandwich for a classic meal.
What to serve with tomato basil soup
Tomato basil soup is traditionally served with something crisp and toasted. A grilled cheese sandwich is the classic choice, and a sourdough slice with a little mozzarella and fresh basil on top is a good upgrade. For a lighter meal, pair the soup with a crisp green salad dressed in lemon vinaigrette.
For a more filling dinner, add protein. Shredded rotisserie chicken or white beans stirred into each bowl make the soup more substantial. If you're building a balanced plate, broccoli soup is another creamy option for a soup night, and a mason jar salad makes an easy side for lunches.
Frequently asked questions
Can I make tomato basil soup without roasting the tomatoes?
You can, but the flavor will be lighter and less sweet. Simmering raw tomatoes for 20 to 25 minutes produces a soup that works, but roasting at 425°F for about 30 minutes adds caramelized depth that is the main reason this version tastes richer.
Is this tomato basil soup healthy?
It is a vegetable-forward soup with tomatoes, onion, garlic and basil, and tomatoes provide vitamin C and lycopene. To keep it lighter, use the Greek yogurt or skip the half-and-half. You can check the nutrient values of individual ingredients in the USDA FoodData Central database.
Can I freeze tomato basil soup?
Yes. Freeze it for up to 3 months in airtight containers, leaving headspace for expansion. Add the half-and-half after reheating, since dairy can separate after freezing.
Why is my tomato basil soup too acidic?
Underripe or out-of-season tomatoes can taste sharp. Roasting helps, and a pinch of sugar or a little extra roasted carrot will balance the acidity. Adding the creamy finish also softens sharp edges.
Can I use dried basil instead of fresh?
Fresh basil gives the best aroma. If you must use dried, use about 1 tsp, stir it in during the simmer, and add a few fresh leaves on top for brightness.
How long does tomato basil soup last in the fridge?
Store it in an airtight container and eat it within 3 to 4 days. Cool it promptly and refrigerate within 2 hours of cooking for food safety.
Roasted Tomato Basil Soup
A creamy, naturally sweet tomato basil soup made by roasting tomatoes, onion and garlic before blending with broth and fresh basil.
Ingredients
Instructions
- Heat the oven to 425°F and line a rimmed baking sheet with parchment.
- Arrange the halved tomatoes cut side up with the onion quarters and unpeeled garlic. Drizzle with 3 tbsp olive oil, 1 tsp salt and 1/2 tsp pepper.
- Roast for 30 to 35 minutes, until the tomatoes collapse and the edges brown.
- Cool for 5 minutes, then squeeze the garlic from its skins into a large pot. Scrape in the tomatoes, onion and juices.
- Stir in the tomato paste and broth. Simmer over medium heat for 10 minutes.
- Off the heat, add most of the basil and blend until smooth.
- Return to low heat, stir in the half-and-half, and season with salt and pepper to taste. Do not boil.
- Serve topped with reserved basil leaves and a drizzle of olive oil.
Notes
- For canned tomatoes, use two 28 oz cans of whole peeled tomatoes, drained slightly, and roast for 25 minutes.
- For a lighter version, replace the half-and-half with 1/2 cup plain Greek yogurt stirred in off the heat.
- Store refrigerated soup for 3 to 4 days or freeze for up to 3 months, without dairy if possible.
Nutrition per serving
- Calories
- 154
- Protein
- 5.4g
- Carbs
- 13g
- Fat
- 10.2g
- Saturated fat
- 2.7g
- Fiber
- 2.9g
- Sugar
- 7.1g
- Sodium
- 448mg
- Cholesterol
- 7mg
