Roasted Tomato Basil Soup

Tomatoes, onions, and garlic are roasted, blended with basil, and served with toppings.

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Introduction

Roasted tomato basil soup combines simple ingredients to create a naturally sweet and deeply flavored dish. The core of this recipe lies in roasting plum tomatoes, onions, and garlic until they develop a rich, caramelized taste that forms the soup's foundation.

While many tomato soup recipes rely on cream for richness, this version achieves its smooth, creamy texture through the natural properties of roasted vegetables and olive oil. Fresh basil, added after blending, provides an aromatic element that complements the sweetness of the roasted tomatoes without overwhelming them.

The preparation process is methodical and uncomplicated: vegetables are roasted until properly caramelized, blended with fresh basil and stock (or water), then gently reheated. This method preserves the fresh taste of the basil while allowing the roasted flavors to fully develop.

This soup works equally well as a starter or a light main course when paired with crusty bread. It keeps well for several days, making it practical for meal preparation or batch cooking. The basic recipe can be adjusted to accommodate different tomato varieties, though plum tomatoes are recommended for their meat-to-juice ratio.

The finishing touches of extra virgin olive oil, croutons, and fresh basil add both visual appeal and textural contrast to the smooth soup. These elements can be adjusted or omitted based on preference, as the soup's core flavors stand well on their own.

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Prep Time

Cook Time

Servings

Calorie/Serving

Ingredients

Instructions

  1. Prep Sheet: To a baking sheet, add 2.2 lb quartered tomatoes, 3 medium-large onions (petals or chunks), and 7 large garlic cloves (whole or sliced).
  2. Season Vegetables: Drizzle 3 tablespoons olive oil and sprinkle salt and pepper over the vegetables. Massage and coat well using your hands.
  3. Roast Vegetables: Transfer to a preheated oven and roast for 50 minutes at 230°C (445°F). Every oven is different so you might have to adjust this by as much as 10-15 minutes. Just make sure the tomatoes are nicely roasted.
  4. Monitor Roasting: IMPORTANT NOTE: Onion and garlic roast faster than tomatoes, and they may burn depending on how you’ve cut them. Petal-cut onions and sliced garlic may char (which is good), but then they may also burn (not good) if left unchecked. You may have to remove them at 30-35 minute mark. Alternatively, if you’re using roughly chopped onion chunks and whole garlic, you don’t have to worry about them burning.
  5. Cool Mixture: Once roasted, let everything cool for 3-4 minutes and transfer to a high-speed blender.
  6. Blend Ingredients: Add 3 handfuls fresh basil leaves and 2 cups vegetable stock (or water) to the blender and blend until creamy.
  7. Heat Soup: Transfer the mixture to a saucepan and reheat. Do not boil – boiling will affect the taste of fresh basil.
  8. Final Garnish: Transfer to serving bowl(s) and top with a drizzle of extra virgin olive oil, croutons, freshly chopped basil leaves, and sea salt flakes. Enjoy!

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Recipe Notes

  • Plum tomatoes work best, but a mix of plum and cherry tomatoes adds variety.
  • Use veggie stock instead of water for added depth of flavor.
  • Roasting times may vary depending on your oven. Keep an eye on the onions and garlic.
  • Remove charred onion and garlic to prevent them from burning.
  • Whole garlic cloves roast slower than sliced ones, reducing the risk of burning.
  • Blend the soup until creamy, adjusting water for your desired consistency.
  • Do not boil the soup after adding fresh basil to preserve its flavor.
  • Use extra virgin olive oil for topping to enhance the soup’s richness.
  • Add optional heat with chili flakes or pepper.
  • Serve with freshly toasted croutons for a crunchy texture.
  • Store leftovers in the fridge for 3-4 days, reheating gently before serving.
  • Freeze without toppings in airtight containers for up to 2 months.

Frequently Asked Questions

Yes, canned tomatoes can be used effectively for roasted tomato soup. Drain excess liquid, and roast as you would fresh tomatoes. They often work well, especially when fresh tomatoes are out of season, providing consistent flavor and convenience.

Use whole garlic cloves or add sliced garlic halfway through the roasting process.

Fresh basil is preferred for flavor, but you can use dried basil in smaller quantities.

Add red chili flakes or a pinch of cayenne pepper while reheating.

Try toasted bread cubes, crackers, or omit the toppings for a lighter option.

No, boiling will alter the flavor of the fresh basil; reheat gently instead.

Yes, carrots or red bell peppers can be roasted and added for extra sweetness.

Absolutely, just ensure your blender and baking sheet can handle the increased volume.

Yes, though a high-speed blender will give a smoother consistency.

Pair it with a hearty salad or a side of garlic bread for a complete meal.

Yes, it’s mild and can be adjusted to their tastes by reducing pepper.

Nutritional Info (per Serving)

  • Calories: 355 kcal
  • Carbohydrates: 38 g
  • Protein: 7 g
  • Fat: 22 g
  • Saturated Fat: 3 g
  • Polyunsaturated Fat: 3 g
  • Monounsaturated Fat: 16 g
  • Sodium: 45 mg
  • Potassium: 1462 mg
  • Fiber: 9 g
  • Sugar: 20 g
  • Vitamin A: 4295 IU
  • Vitamin C: 84 mg
  • Calcium: 116 mg
  • Iron: 2 mg

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