Roasted Tomato Soup with Crispy Grilled Cheese

Roasted tomato soup with crispy grilled cheese is a comfort-food lunch that gets its depth from the oven. Ripe tomatoes, onion, and garlic roast until their edges caramelize and their juices concentrate; a quick simmer with broth turns them into a bright, savory soup. The grilled cheese is cooked separately in a skillet until the bread is deeply golden and the cheddar melts into a gooey center. Dip each crisp triangle into the warm tomato soup for the classic combination at its best.

This version is intentionally lighter and more tomato-forward than a cream-heavy soup. A little olive oil, broth, basil, and a splash of balsamic vinegar bring the roasted vegetables together without covering their flavor. You can add a swirl of cream if you prefer a silkier bowl, but the soup is delicious without it. The grilled cheese uses sturdy sourdough or country bread and a mix of sharp cheddar and mozzarella: cheddar gives flavor, while mozzarella helps the middle stretch.

For crisp bread, spread a thin layer of mayonnaise or softened butter all the way to the edges, then cook slowly over medium-low heat. High heat can brown the outside before the cheese melts. Grating the cheese and covering the pan briefly helps it melt before the bread gets too dark. Keep the soup warm while the sandwiches cook, and serve immediately so the crust stays crunchy.

This recipe includes roasting tips, blender safety, dairy-free options, meal-prep advice, and a complete recipe card. It is an easy weeknight supper, a cozy weekend lunch, and a reliable way to use a tray of ripe tomatoes.

Recipe at a glance: Prep 15 minutes; roast 35–40 minutes; simmer 15 minutes; serves 4; difficulty easy. Makes about 6 cups soup and 4 grilled cheese sandwiches.

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Why This Tomato Soup and Grilled Cheese Works

Roasting concentrates the tomatoes. High oven heat evaporates some water and caramelizes the natural sugars at the edges. That creates a deeper flavor than simply simmering raw tomatoes.

The soup stays bright and balanced. Basil, garlic, broth, and a small splash of balsamic wake up the roasted tomato flavor. The vinegar is added near the end so it stays fresh rather than sharp.

The grilled cheese gets truly crisp. Medium-low heat gives the cheese time to melt while the bread browns evenly. A thin, even coating of mayonnaise or butter helps the crust turn golden.

You can make the parts separately. Roast and blend the soup ahead, then cook sandwiches just before serving. For more cozy dinners, try Creamy Chicken and Mushroom Soup, Zesty Lemon Chicken Orzo Soup, Creamy Tortellini Soup, Thai Red Curry Noodle Soup, and Olive Garden Chicken Gnocchi Soup.

Ingredients You’ll Need

Roasted Tomato Soup

Ripe tomatoes: 2½ lb (1.1 kg), such as Roma, plum, or vine-ripened tomatoes. Halve smaller tomatoes and quarter larger ones.

Yellow onion: 1 medium, cut into wedges.

Garlic: 5 cloves, peeled and left whole.

Olive oil: 2 tablespoons (30 ml).

Fine salt: 1 teaspoon, plus more to taste; black pepper: ½ teaspoon.

Vegetable or chicken broth: 2 cups (480 ml), preferably low-sodium.

Tomato paste: 1 tablespoon (15 g), optional for deeper tomato flavor.

Fresh basil: ½ cup loosely packed leaves, plus extra to serve.

Balsamic vinegar: 1 teaspoon, plus more to taste.

Sugar: ½ teaspoon only if the tomatoes are unusually acidic.

Optional cream: ¼ cup (60 ml) heavy cream or unsweetened oat cream.

Crispy Grilled Cheese

Bread: 8 slices sourdough or country bread, about ½ inch thick.

Sharp cheddar: 180 g (6 oz), grated.

Low-moisture mozzarella: 100 g (3½ oz), grated.

Mayonnaise or softened butter: about 4 tablespoons total.

Optional: pinch of black pepper or a few thin slices of tomato.

Equipment

Use a rimmed baking sheet, parchment paper, a medium pot, an immersion blender or heat-safe blender, a spatula, and a large skillet or griddle. If using a countertop blender, blend hot soup in small batches and follow the manufacturer’s hot-liquid instructions. Do not seal a blender full of steaming liquid.

How to Make Roasted Tomato Soup

1. Heat the oven. Set the oven to 425°F (220°C). Line a rimmed baking sheet with parchment for easier cleanup.

2. Arrange the vegetables. Place tomatoes cut-side up, onion wedges, and whole garlic cloves on the sheet. Drizzle with olive oil, then season with salt and pepper. Arrange the vegetables in one layer; crowding can cause them to steam rather than roast.

3. Roast until tender and browned. Roast for 35–40 minutes, until tomatoes are very soft, onions have golden edges, and garlic is tender. If the garlic browns too quickly, remove it earlier.

4. Simmer the soup. Transfer roasted vegetables and their juices to a pot. Add broth and tomato paste, if using. Bring to a gentle simmer and cook for 10 minutes so the flavors combine.

5. Blend carefully. Turn off the heat and blend with an immersion blender until smooth, or let the soup cool slightly and blend in small batches. Return blended soup to the pot.

6. Finish the flavor. Stir in basil and balsamic vinegar. Taste and add more salt, pepper, or a tiny pinch of sugar if needed. For a creamier bowl, stir in cream and warm gently without boiling.

How to Make Crispy Grilled Cheese

1. Mix the cheeses. Combine cheddar and mozzarella in a bowl. Grating the cheese helps it melt quickly and evenly.

2. Prepare the bread. Spread a thin layer of mayonnaise or softened butter on one side of each bread slice. Set four slices coated-side down and divide cheese among them. Top with remaining bread, coated-side up.

3. Cook slowly. Heat a skillet over medium-low heat. Add sandwiches and cook 3–5 minutes per side, pressing gently with a spatula. Lower the heat if the bread browns too quickly.

4. Melt the center. If the bread is golden but the cheese is not fully melted, cover the skillet for 30–60 seconds. Watch closely so condensation does not soften the crust.

5. Rest and slice. Let the sandwiches rest for 1 minute, then slice into halves or triangles with a serrated knife. Serve immediately with hot soup.

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Tips for the Best Result

Use ripe tomatoes. The riper the fruit, the sweeter and more flavorful the soup. If tomatoes are pale or underripe, add tomato paste and taste for acidity.

Roast cut-side up. This helps the tomatoes soften and brown without losing all their juices. Keep the tray juices; they carry flavor into the soup.

Do not overfill the blender. Steam expands. Blend hot liquids in small batches with the vent open if your blender model allows it, holding a towel over the opening, or cool the mixture first.

Use low-moisture cheese. Fresh mozzarella contains more water and can make the sandwich soggy. Low-moisture mozzarella melts well and pairs with sharp cheddar.

Cook grilled cheese over moderate heat. The goal is a golden crust and fully melted center at the same time. Patience is the secret to both.

Keep soup and sandwiches separate until serving. Dipping is delicious; letting the sandwiches sit in soup will soften the crisp bread.

Troubleshooting

The soup tastes too acidic. Add a pinch of sugar or a small splash of cream, then taste again. Do not add much at once.

The soup is too thin. Simmer uncovered for a few minutes to reduce, or stir in another teaspoon of tomato paste. Avoid adding flour directly to the hot soup.

The soup is too thick. Stir in warm broth a little at a time until it reaches your preferred consistency.

The grilled cheese browns before the cheese melts. Lower the heat and cover the pan briefly. Use grated cheese and avoid very thick bread slices.

The bread is greasy. Use a thinner, even coating of butter or mayonnaise. The bread should be coated, not saturated.

Variations

Spicy roasted tomato soup: Add ¼ teaspoon red pepper flakes to the vegetables before roasting.

Smoky version: Add ½ teaspoon smoked paprika to the soup during simmering.

Vegan option: Use vegetable broth, omit the cream, and make grilled cheese with a dairy-free melting cheese and plant-based spread.

Herb variation: Add fresh thyme to the roasting tray or stir in chopped parsley at the end.

Open-faced cheesy toast: Toast bread separately, top with cheese, and broil briefly until bubbly. Serve alongside soup for an easy alternative.

Make-Ahead and Storage

Roast and blend the soup up to 3 days ahead. Cool it and refrigerate in a covered container. Reheat gently in a saucepan, stirring often. Store grilled cheese separately and cook it fresh for the crispiest texture. For safe cooling, the Food Standards Agency advises chilling leftovers within two hours, eating refrigerated leftovers within 48 hours or freezing, and reheating once until steaming hot throughout. See FSA chilling guidance and cooking and reheating advice.

Freeze soup without cream for up to 3 months for best quality. Thaw in the refrigerator and reheat gently; add cream after reheating if desired. Grilled cheese is best cooked fresh and is not ideal for freezing after assembly.

Roasted Tomato Soup with Crispy Grilled Cheese Recipe Card

Serves: 4

Prep time: 15 minutes

Roast time: 35–40 minutes

Simmer time: 15 minutes

Oven: 425°F (220°C)

Ingredients

Soup

2½ lb (1.1 kg) ripe tomatoes, halved or quartered
1 medium yellow onion, cut into wedges
5 garlic cloves, peeled
2 tbsp (30 ml) olive oil
1 tsp fine salt and ½ tsp black pepper
2 cups (480 ml) low-sodium vegetable or chicken broth
1 tbsp (15 g) tomato paste, optional
½ cup fresh basil leaves
1 tsp balsamic vinegar
½ tsp sugar, optional
¼ cup (60 ml) cream, optional

Grilled cheese

8 slices sourdough or country bread
180 g (6 oz) sharp cheddar, grated
100 g (3½ oz) low-moisture mozzarella, grated
4 tbsp mayonnaise or softened butter

Instructions

Heat oven to 425°F (220°C). Arrange tomatoes, onion, and garlic on a lined baking tray. Drizzle with oil and season.
Roast 35–40 minutes, until tender and browned at the edges.
Transfer vegetables and tray juices to a pot. Add broth and tomato paste. Simmer 10 minutes.
Turn off heat and blend smooth with an immersion blender, or blend cooled soup in small batches.
Stir in basil and balsamic vinegar. Taste and adjust. Stir in cream if desired.
Mix cheddar and mozzarella. Spread mayonnaise or butter on bread. Fill four sandwiches with cheese.
Cook in a skillet over medium-low heat for 3–5 minutes per side until crisp and melted. Cover briefly if needed.
Rest 1 minute, slice, and serve with soup.

Cook’s notes: Add sugar only if needed to balance acidity. Blend hot soup carefully in small batches. For the crispest sandwich, cook just before serving.

Final Thoughts

Roasted tomato soup with crispy grilled cheese turns simple ingredients into a deeply satisfying meal. Roasting concentrates the tomatoes, while a gentle skillet cook gives the sandwiches a golden crust and melted center. Keep the soup bright with basil and balsamic, and serve the sandwiches separately so they stay crisp until the first dip. It is an easy meal to return to whenever tomatoes are ripe or the weather calls for something warm.

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Frequently Asked Questions

Can I use canned tomatoes instead of fresh?

Yes, especially when fresh tomatoes are out of season. Use two 28-ounce cans of whole peeled tomatoes, drain lightly, and roast with the onion and garlic. Check seasoning because canned tomatoes vary in salt and acidity.

Do I have to add cream?

No. The recipe is designed to be tomato-forward without cream. Add a little cream or oat cream if you prefer a smoother, richer bowl.

Which tomatoes are best for roasting?

Roma, plum, or ripe vine tomatoes work well because they have concentrated flavor. A mix of varieties can also be delicious.

How do I make grilled cheese extra crispy?

Spread a thin layer of mayonnaise or softened butter over the outside of the bread and cook over medium-low heat. Avoid high heat, which browns bread before the cheese melts.

What cheese melts best for grilled cheese?

Sharp cheddar provides flavor, while low-moisture mozzarella helps the cheese stretch. Monterey Jack or fontina can also work.

Can I make the soup ahead?

Yes. Roast and blend it up to 3 days ahead, refrigerate, and reheat gently. Make the grilled cheese just before serving.

Can I freeze roasted tomato soup?

Yes. Freeze it without cream for best texture. Thaw in the refrigerator and reheat gently, adding cream after reheating if desired.

How do I thicken tomato soup?

Simmer it uncovered to evaporate excess liquid or add a little tomato paste. Blend the soup thoroughly for a smooth, fuller texture.

Is this recipe vegetarian?

It is vegetarian when made with vegetable broth and no dairy cream. Use plant-based cheese and spread to make the full meal vegan.

How should I store leftovers?

Cool and refrigerate the soup promptly in a covered container. Follow local food-safety guidance; FSA recommends chilling within two hours and reheating leftovers once until steaming hot throughout.