This is a roasted tomato soup that gets its richness from blended cashews instead of cream — and most people can’t tell the difference. Roasting the tomatoes first is the whole point: it cuts the raw acidity and builds a deeper, sweeter flavor that a stovetop-only version just doesn’t have. It’s the kind of soup that works for a weeknight dinner and holds up fine when you’re feeding people who aren’t sure about plant-based cooking.
Before you start
Two things actually matter here. First, soak your cashews long enough — at least 2 hours in cold water, or 20 minutes in just-boiled water if you’re short on time. Under-soaked cashews leave the soup grainy no matter how long you blend. Second, don’t rush the tomato paste step. Cooking it until it darkens and sticks slightly to the pan takes only a couple of minutes, but it adds a concentrated, savory depth that you can’t get any other way. Everything else in this recipe is fairly forgiving.
Substitutions that actually work
- San Marzano tomatoes: Whole peeled San Marzanos are ideal, but any good-quality whole canned tomatoes work. Avoid diced — they often contain calcium chloride, which keeps them firm and makes blending harder.
- Cashews: Raw sunflower seeds, soaked the same way, blend into a similarly neutral cream. The color will be slightly different but the texture holds up.
- Sherry vinegar: Red wine vinegar is a direct swap. Apple cider vinegar works in a pinch but adds a faint fruitiness.
- Fresh basil: If you only have dried, add a small pinch with the other aromatics — don’t add it at the end, it won’t do anything useful there. Fresh is genuinely better here, though.
- Sourdough for croutons: Any sturdy bread works. A day-old baguette or ciabatta gives you the same crunch. Skip the garnish if you’re making this for meal prep — not worth the extra dish.
Leftovers and meal prep
The soup keeps well in the fridge for up to 5 days in a sealed container. It thickens as it sits — add a splash of water or vegetable broth when reheating on the stovetop over medium-low heat, stirring occasionally. For freezing, leave out the cashew cream and add it fresh after thawing; the base freezes cleanly for up to 3 months. Freeze in individual portions if you want easy weekday lunches. Thaw overnight in the fridge, then reheat gently — high heat can make the cashew cream separate slightly, though a quick stir usually brings it back together.
Troubleshooting
- Soup tastes flat even after seasoning: The tomatoes may not have roasted long enough to lose their raw edge. A small extra pinch of salt often isn’t the fix — try a few more drops of sherry vinegar first, which wakes up the other flavors without making it taste sour.
- Texture is grainy or not fully smooth: The cashews weren’t soaked long enough, or your blender needs more time. Blend for a full 60–90 seconds on high. If you’re using an immersion blender, the cashew cream may never get fully silky — transfer to a countertop blender for that step.
- Soup is too thin: Simmer uncovered for an additional 5–10 minutes after blending to reduce it. The roasted tomatoes should have provided enough body, but canned tomato brands vary in water content.
- Soup is too thick: Add warm vegetable broth a quarter-cup at a time until you reach the consistency you want. Cold liquid added all at once can dull the flavor.
- Tastes too acidic despite the maple syrup: A small pinch of baking soda (start with one-eighth teaspoon) neutralizes sharpness quickly. Add it carefully — it fizzes and a little goes a long way.
Velvety Roasted Tomato Soup (Vegan)
Equipment
- Rimmed half sheet pan
- Parchment paper (optional)
- Dutch oven or heavy-bottomed pot (5–6 qt)
- Chef's knife
- Cutting board
- Measuring cups and spoons
- Immersion blender or countertop blender
- Fine-mesh sieve (optional, for extra-smooth texture)
- Ladle
Ingredients
- 0.5 cup raw cashews For creaminess; choose unsalted, unroasted
- 1 cup boiling water For soaking cashews; will be drained
- 2.5 lb ripe tomatoes, halved (Roma or heirloom) Peak-season, vine-ripened for best flavor
- 2 tbsp extra-virgin olive oil For roasting tomatoes; a peppery EVOO is ideal
- 0.5 tsp kosher salt For tomatoes before roasting
- 0.25 tsp freshly ground black pepper For tomatoes before roasting
- 2 cup sourdough bread, cut into 3/4-inch cubes For croutons (about 6 oz)
- 1 tbsp extra-virgin olive oil For croutons
- 0.25 tsp garlic powder For croutons
- 1 pinch kosher salt For croutons
- 1 tbsp extra-virgin olive oil For sautéing aromatics
- 1 large yellow onion, diced small About 12 oz
- 1 medium carrot, diced small
- 1 rib celery, diced small
- 1 tsp kosher salt For aromatics
- 4 cloves garlic, thinly sliced or minced Fresh garlic for best aroma
- 2 tbsp tomato paste Double-concentrated if available (e.g., Mutti)
- 0.5 tsp smoked paprika Adds gentle smokiness
- 0.25 tsp crushed red pepper flakes Optional heat
- 1 tbsp sherry vinegar Or red wine vinegar
- 28 oz whole peeled San Marzano tomatoes, with juices 1 can; DOP-certified preferred
- 3 cup low-sodium vegetable broth Homemade or high-quality store-bought
- 2 tsp pure maple syrup Balances acidity (or use organic cane sugar)
- 1 bay leaf
- 0.125 tsp baking soda Optional; softens acidity
- 0.5 cup fresh basil leaves, torn Plus extra for garnish
- 0.75 cup water For blending cashew cream
- 1 tsp extra-virgin olive oil For finishing
- 0.5 tsp freshly ground black pepper For finishing, to taste
Instructions
Preparation Instructions
- Preheat the oven to 425°F (220°C). Line a rimmed sheet pan with parchment for easy cleanup.
- Add the cashews to a heatproof bowl and cover with 1 cup boiling water. Soak for 15 minutes while you prep the vegetables and start roasting. This softens them for a silky cream.
- Toss the halved tomatoes with 2 tbsp olive oil, 1/2 tsp kosher salt, and 1/4 tsp black pepper. Arrange cut-side up on the sheet pan. Roast at 425°F (220°C) for 25 minutes, until edges blister, juices bubble, and the aroma is sweet and concentrated.
- For croutons (optional but recommended): In a bowl, toss the sourdough cubes with 1 tbsp olive oil, 1/4 tsp garlic powder, and a pinch of salt. During the last 8–10 minutes of tomato roasting, spread the cubes on a corner of the pan (or a second pan) and bake until golden and crisp.
- Warm 1 tbsp olive oil in a Dutch oven over medium heat. Add the onion, carrot, celery, and 1 tsp kosher salt. Sauté 8–10 minutes, stirring occasionally, until the vegetables are translucent with lightly golden edges and smell sweet.
- Add the garlic and cook 1 minute until fragrant. Stir in the tomato paste and cook 2–3 minutes, stirring, until it darkens to a deep brick red and leaves a fond on the pot—this builds umami.
- Sprinkle in the smoked paprika and red pepper flakes; cook 30 seconds. Deglaze with the sherry vinegar, scraping up the fond with a wooden spoon.
- Pour in the canned whole tomatoes with their juices (crush them by hand as you add), the roasted tomatoes and any pan juices, vegetable broth, maple syrup, bay leaf, and the baking soda (optional). Bring to a gentle boil, then reduce to a lively simmer. Partially cover and cook 12–15 minutes to meld flavors.
- Make the cashew cream: Drain the soaked cashews. Blend with 3/4 cup water on high for 45–60 seconds until completely smooth and glossy. If you don’t have a high-speed blender, blend longer or strain through a fine-mesh sieve for extra silkiness.
- Fish out and discard the bay leaf. Add the torn basil. Blend the soup until smooth using an immersion blender. Alternatively, blend in batches in a vented countertop blender (fill halfway, hold a towel over the lid to prevent steam buildup). For ultra-smooth texture, pass through a fine-mesh sieve.
- Stir in the cashew cream. If needed, thin with a splash of broth to your preferred consistency. Warm gently over low heat for 2–3 minutes—avoid boiling to keep the flavor fresh. Finish with 1 tsp olive oil and season with additional salt and black pepper to taste.
Chef’s Tips
- Deeper sweetness: Let the tomato paste caramelize thoroughly before deglazing—watch for a deeper color and toasty aroma.
- Balance like a pro: A tiny pinch of baking soda softens sharp acidity; a teaspoon of vinegar at the end brightens if it tastes flat.
- Nuts or not: Swap cashew cream with 2/3 cup full-fat coconut milk for nut-free. Or blend in 1/2 cup cooked cannellini beans plus 1–2 tbsp olive oil for body.
- All-canned version: If fresh tomatoes aren’t at peak, roast drained canned whole tomatoes at 425°F (220°C) for 15 minutes to concentrate, or use two 28-oz cans total and simmer 10 extra minutes.
- Smoky twist: Char halved tomatoes under the broiler for 3–5 minutes until lightly blackened, or finish the soup with a pinch of smoked salt.
- Faster caramelized onions: Add a splash of water if browning too quickly; the steam helps soften and accelerate the process evenly.
Serving Suggestions
- Ladle into warmed bowls. Garnish with basil chiffonade, a few golden croutons, a glossy drizzle of olive oil, and freshly cracked black pepper. The ideal bowl is sunset red-orange, silky and pourable but not thin, with aromas of sweet tomato and fresh basil. Pair with a vegan grilled cheese on sourdough, a simple arugula salad with lemon, or a crisp Italian white (or sparkling water with a lemon twist).
Culinary Context
- Rooted in Italian and broader Mediterranean traditions, tomato soup celebrates the region’s devotion to ripe produce and humble technique—roast, simmer, blend. I grew up loving the classic canned version; this is the elevated, from-scratch bowl I craved: concentrated roasted tomatoes, honest aromatics, and dairy-free creaminess that lets the fruit shine.
Optional Advanced Instructions
- Make-ahead: Roast tomatoes up to 3 days in advance and refrigerate with their juices. Croutons keep airtight for 2 days.
- Basil oil swirl: Blend 1/2 cup basil with 1/3 cup EVOO and a pinch of salt. Strain for a vibrant green drizzle.
- Ultra-smooth finish: After blending, pass the soup through a fine-mesh sieve, pressing with a ladle, then rewarm gently.
- Beginner alternative: Skip roasting and use two 28-oz cans of tomatoes; add 1 tsp sugar and simmer 20 minutes for depth.
Timing
- Prep Time: 20 minutes
- Cook Time: 55 minutes (roast 25 min; croutons 8–10 min overlapping; sauté/paste 10–12 min; simmer 12–15 min; blend/finish 5 min)
Notes
- For best results, use peak-season tomatoes or top-quality DOP San Marzano canned tomatoes.
- Warm bowls before serving to keep the soup hot.
- Store leftovers refrigerated up to 4 days or freeze up to 3 months; thaw overnight and reheat gently without boiling.
Nutrition
FAQ
Can I use fresh tomatoes instead of canned?
Yes, but the results vary a lot depending on the season. Use about 2.5 pounds of ripe Roma or plum tomatoes, halved and roasted the same way. Out-of-season fresh tomatoes tend to be watery and less flavorful than a good canned San Marzano, so canned is often the better call outside of peak summer.
Do I really need to soak the cashews?
Yes, unless you have a high-powered blender like a Vitamix. Unsoaked cashews won’t break down fully in a standard blender and will leave a gritty texture in the finished soup. Even 20 minutes in boiling water makes a real difference.
Can I make this without a blender?
You can use a food mill or fine-mesh strainer and press the soup through in batches, but you won’t get the same smooth texture. The cashew cream step specifically needs a blender — if you skip it, replace it with a can of full-fat coconut milk stirred in at the end for a different but still creamy result.
Is this soup freezer-friendly?
The tomato base freezes very well for up to 3 months. For best results, freeze it before adding the cashew cream, then blend in fresh soaked cashews after thawing and reheating.
How do I make this more filling as a main meal?
Serve it with substantial bread — a thick slice of sourdough or a toasted baguette makes it a proper meal. You can also stir in cooked white beans or small pasta shapes like ditalini directly into the pot for extra protein and substance.
Can I make this ahead for a dinner party?
Yes, and it actually tastes better the next day once the flavors have settled. Make the full soup up to 2 days ahead, refrigerate it, and reheat gently on the stovetop. Make the croutons the day of serving so they stay crisp.
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