Marrow and Tomato Soup Recipe with Fresh Garden Herbs

Marrow and tomato soup is a gently savory vegetable soup made with mature marrow squash, tomatoes, onion, and stock, then blended to a smooth or softly chunky texture. It is an easy way to use a large summer marrow, and it tastes especially good served hot with bread and a little fresh basil.

Ingredients

2 lb mature marrow squash, peeled if the skin is tough, seeded, and chopped into 1-inch pieces (about 8 cups / 900 g prepared)
1 medium yellow onion, chopped (about 1 1/2 cups / 225 g)
1 medium carrot, peeled and diced (about 1 cup / 130 g)
1 tablespoon olive oil (15 ml)
2 garlic cloves, finely chopped (about 2 teaspoons / 6 g)
2 tablespoons tomato paste (32 g)
1 can crushed tomatoes (28 oz / 794 g, about 3 1/2 cups)
4 cups vegetable stock (960 ml), plus a little more if needed
1 teaspoon fine salt (6 g), or to taste
1/4 teaspoon freshly ground black pepper (about 0.5 g), plus more to taste
1 teaspoon granulated sugar (4 g), optional, if the tomatoes taste sharply acidic
1 tablespoon lemon juice (15 ml)
1/4 cup loosely packed fresh basil leaves, chopped (about 10 g)

Instructions

Prepare the marrow and vegetables. Rinse the marrow and pat it dry. If it has a firm, waxy skin, peel it; if the skin is thin and tender, it can stay on. Cut the marrow lengthwise and scoop out the spongy center and large seeds with a spoon. Chop the firm flesh into pieces about 1 inch across. Chop the onion, dice the carrot, and mince the garlic. Preparing the pieces to a similar size helps them soften evenly.
Soften the onion and carrot. Warm the olive oil in a large heavy-bottomed pot or Dutch oven over medium heat. Add the onion and carrot and cook for 7 minutes, stirring every minute or two, until the onion looks translucent and the carrot has begun to soften. Lower the heat if the onion starts browning; the goal is a mellow base rather than a deeply fried one.
Cook the garlic and tomato paste. Stir in the garlic and cook for 30 seconds, just until fragrant. Add the tomato paste and stir continuously for another 30 seconds so it darkens slightly and coats the vegetables. Avoid letting the garlic turn brown, which can make the finished soup taste bitter.
Add the tomatoes, marrow, and stock. Tip in the crushed tomatoes, chopped marrow, vegetable stock, salt, pepper, and the optional sugar. Stir and scrape the bottom of the pot to loosen any tomato paste. Bring the mixture just to a boil, then reduce the heat to maintain a gentle simmer. Partly cover the pot and cook for 25 minutes, stirring once or twice. The marrow is ready when a fork slides through the thicker pieces without resistance.
Blend to your preferred texture. Take the pot off the heat. Use an immersion blender to puree the soup in the pot, moving it around slowly until the texture is even. For a more rustic bowl, blend only about three-quarters of the soup and leave some soft marrow pieces intact. If using a countertop blender, work in small batches, vent the lid according to the blender’s instructions, and avoid filling it more than halfway because hot liquid expands.
Adjust the seasoning. Return the blended soup to low heat and stir in the lemon juice and chopped basil. Warm for 4 minutes, without bringing it back to a hard boil. Taste and add more salt, pepper, or lemon as needed. If it is thicker than you like, stir in stock a little at a time; if it is thin, simmer it uncovered for a few minutes, stirring so the bottom does not catch.
Serve hot. Ladle into warm bowls and finish with extra basil or a drizzle of olive oil if you like. The soup is ready as soon as it is hot and seasoned to your preference.

Tips

Choose a marrow with firm flesh. A mature marrow can be quite large, but avoid one with soft, sunken patches or a sour smell. Very large specimens often have a watery center and tough skin, so remove the seeds and peel as needed. Weighing the prepared flesh is more reliable than judging a whole marrow by size.
Control the thickness before adding extra liquid. Marrow releases moisture as it simmers, and the amount varies with its age and size. Begin with the stated 4 cups of stock, blend, and only then thin the soup. A little extra stock is easier to add than to cook away after the soup has been fully seasoned.
Use stock with a moderate salt level. Some prepared stocks are much saltier than others. If yours is salted, start with half the listed salt, then taste after blending and add more. If you do not have vegetable stock, use water and increase the herbs and seasoning slightly; the tomato and browned tomato paste still give the soup plenty of flavor.
Keep the simmer gentle. A vigorous boil can make the soup splatter and may cause the vegetables to break down unevenly. Stir the pot periodically, especially after blending or when reducing it uncovered, since thick soup can catch on the base.

Serving Suggestions

Serve this soup as a light main course with crusty sourdough, a warm baguette, or simple cheese toast. For a fuller meal, pair it with a grilled cheese sandwich, a green salad with a sharp vinaigrette, or a plate of roasted vegetables. The acidity in the tomatoes makes rich or buttery accompaniments a particularly good match.

For toppings, try a spoonful of plain yogurt or crème fraîche, a few torn basil leaves, black pepper, or toasted pumpkin seeds. A small amount of grated Parmesan adds a salty, savory finish; omit it for a dairy-free bowl. If serving several people, put toppings on the table separately so everyone can choose. The soup is also suitable as a starter: serve smaller portions and keep the texture fairly smooth.

Variations

Add a gentle spice note. Stir 1/2 teaspoon smoked paprika or 1/4 teaspoon dried chili flakes into the tomato paste. Smoked paprika makes the soup taste deeper and toastier; chili adds heat without changing the basic tomato-and-marrow flavor.
Make it creamy. After blending, stir in 1/2 cup (120 ml) heavy cream or unsweetened oat cream and warm gently for a few minutes. Do not boil it hard after adding dairy. For a lighter dairy-free option, use a few tablespoons of coconut milk, keeping in mind that it adds a noticeable coconut aroma.
Use fresh tomatoes when they are ripe. Replace the canned tomatoes with about 2 lb (900 g) ripe tomatoes, chopped. They may release more water and can taste less concentrated, so simmer uncovered for an extra 5 to 10 minutes if needed and adjust the salt and lemon after blending.
Make it more substantial. Stir in 1 can rinsed white beans (15 oz / 425 g, about 1 1/2 cups drained) before blending. Blend them into the soup for body or leave some whole for texture. You may need an extra splash of stock, and the beans make the result thicker and less focused on the marrow alone.

Storage and Reheating

Cool leftovers promptly and refrigerate them within 2 hours of cooking in a covered container. The soup keeps for 3 to 4 days in the refrigerator. For longer storage, freeze it in meal-sized airtight containers for up to 3 months for best quality, leaving a little space at the top for expansion. Thaw overnight in the refrigerator; if the soup separates slightly after freezing, stir or blend it briefly as it warms.

Reheat only the portion you plan to serve, either in a saucepan over medium-low heat or in the microwave in a covered, microwave-safe bowl, stirring at intervals. Bring leftovers to 165°F (74°C), checking with a food thermometer, and avoid repeatedly cooling and reheating the whole batch. Add a splash of stock or water if the soup has thickened in storage. If you have added cream, reheat gently and stir often to keep the texture smooth.

Frequently Asked Questions

Is marrow the same as zucchini? Marrow is a mature summer squash in the same broad family as zucchini. It is usually larger, with a thicker skin, larger seeds, and a milder, sometimes more watery interior. For this soup, use mature marrow if available; large zucchini or courgettes are a practical substitute, though they may need less peeling and seeding.

Do I have to peel and seed the marrow? Not always. Leave the skin on when it is thin and tender, but peel a tough or waxy skin because it may remain unpleasantly firm after cooking. Remove the soft, spongy seed center and large seeds from a mature marrow; they add water and can make the blended soup less smooth. Small, tender zucchini generally do not need to be seeded.

Can I make this soup without a blender? Yes. Simmer the vegetables until very soft, then mash them thoroughly with a potato masher for a rustic, chunky soup. It will not be as silky as a blended version, but the tomato and marrow will still combine into a spoonable broth. Avoid trying to pour hot soup into a small food processor, which can spill or create pressure.

Why does my soup taste bland or too acidic? Marrow has a mild flavor, so the soup may need more salt, pepper, or lemon after blending. Add salt in small pinches and taste again; a little lemon can make a flat tomato flavor seem brighter. If the tomatoes are sharply acidic, add the optional teaspoon of sugar, or stir in a small amount of cream. Do not add a lot of sugar at once, since it can make the soup taste sweet rather than balanced.

Can I prepare it ahead? Yes. The soup can be cooked, cooled, and refrigerated, then reheated when needed; its flavor often settles nicely after a night in the refrigerator. For the freshest herb flavor, reserve some basil and add it just before serving rather than cooking all of it into the soup. Follow the storage and reheating guidance above, particularly the 2-hour cooling limit and 165°F (74°C) reheating temperature.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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