Sourdough Panzanella Salad Heirloom

Featured in: Sweet Seasonal Treats

This vibrant dish brings together crunchy sourdough bread toasted to perfection and juicy heirloom tomatoes, tossed with crisp cucumber and thinly sliced red onion. The fresh basil vinaigrette, blending olive oil, red wine vinegar, and Dijon mustard, adds a fragrant and tangy finish. Letting it rest melds flavors and softens the bread slightly. Ideal for warm days or light meals, topping with mozzarella or burrata enhances its creamy texture.

Updated on Fri, 13 Feb 2026 12:49:00 GMT
Vibrant sourdough panzanella salad with heirloom tomatoes, crunchy croutons, and fragrant basil vinaigrette, perfect for summer dining.  Save to Pinterest
Vibrant sourdough panzanella salad with heirloom tomatoes, crunchy croutons, and fragrant basil vinaigrette, perfect for summer dining. | frostkettle.com

There's a particular moment in late August when tomatoes taste like they've absorbed the entire summer, and that's exactly when this salad showed up at my kitchen counter. A friend brought day-old sourdough from the farmers market, and instead of letting it go stale and sad, we turned it into something that tasted like an Italian afternoon—crispy on the outside, just tender enough to soak up that basil-bright dressing.

I made this for a potluck where someone brought underripe tomatoes from the grocery store, and I almost didn't make it that day—but then I remembered I had heirloom tomatoes from my neighbor's garden in the fridge. That one choice changed everything. The colors alone told a story, and when people started eating it, there was this genuine pause, the kind where you know the food is doing something right.

Ingredients

  • Day-old sourdough bread: Use bread that's a day or two old so it has structure and won't turn to mush when tossed; fresh bread falls apart like a dream.
  • Extra-virgin olive oil: Don't skimp here—this is where half the flavor lives, and you'll taste the difference between good and mediocre.
  • Sea salt: For toasting the bread, it clings better than table salt and adds a subtle mineral finish.
  • Heirloom tomatoes: Pick varieties in different colors if you can; they're sweeter and more complex than regular tomatoes, and they look stunning on the plate.
  • Red onion: Thin slices matter because they'll soften slightly as the salad sits, becoming less sharp and more integrated.
  • Fresh basil: Packed loosely, not shredded—whole leaves make a silkier vinaigrette and stay flecked with green.
  • Red wine vinegar: The acidity brightens everything without overpowering the delicate tomato flavor.
  • Dijon mustard: A small amount acts as an emulsifier, keeping the dressing from separating as it sits.
  • Honey: Just a touch to balance the acidity and let the tomatoes' natural sweetness shine through.
  • Mozzarella or burrata: If you use burrata, tear it gently and add it at the last second so the creamy center stays soft.

Instructions

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Get your oven ready:
Set it to 180°C (350°F) so it's warm by the time you finish prepping the bread. This temperature toasts gently without burning the edges.
Make your croutons:
Toss those 2 cm cubes with olive oil and salt, then spread them out on a baking sheet so they're not touching—they need space to get golden and crisp. Stir them halfway through the 10–15 minutes so they toast evenly on all sides, then let them cool completely.
Blend the basil vinaigrette:
Throw basil, olive oil, vinegar, mustard, honey, garlic, and a pinch of salt and pepper into your blender. Pulse until smooth and bright green, stopping to taste and adjust if it needs more salt or a touch more vinegar to balance the sweetness.
Build your salad base:
In a large bowl, combine tomatoes cut into wedges or bite-sized pieces, cucumber slices, and thin red onion. Add the cooled croutons, mixing gently so you don't bruise the tomato flesh.
Dress and let it rest:
Drizzle the vinaigrette over everything and toss gently—the ten-minute rest is not optional, it's when magic happens. The bread absorbs the dressing, the tomatoes release their liquid, and the flavors deepen.
Finish and serve:
Transfer to a serving platter, tear over mozzarella or burrata if using it, scatter extra basil leaves on top, and serve immediately while the croutons still have that gentle crunch.
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Rustic Italian sourdough panzanella featuring juicy heirloom tomatoes, crisp cucumber, and creamy mozzarella, tossed with basil dressing.  Save to Pinterest
Rustic Italian sourdough panzanella featuring juicy heirloom tomatoes, crisp cucumber, and creamy mozzarella, tossed with basil dressing. | frostkettle.com

What surprised me most was watching my dad, who usually eats salad like it's a chore, come back for seconds. He stood at the counter picking through it, looking for that perfect bite of tomato and crispy bread, and something shifted—he actually understood why I get excited about simple food done well.

Why Sourdough Changes Everything

Regular bread falls apart in vinaigrette, but sourdough has a structure and tang that pushes back against the acidity. The fermentation gives it flavor complexity that plays beautifully with basil, and it's sturdy enough to actually toast golden instead of just drying out. If you've never made a salad with sourdough croutons, you're missing one of those small kitchen revelations that makes you wonder why you've been doing it any other way.

Making the Vinaigrette Feel Fresh

The blender matters here because you want the basil completely smooth, almost emulsified into the oil—hand whisking won't get you there. When you open that blender lid, the smell of fresh basil mixed with vinegar and garlic hits you before anything else, and that's your sign it's working. If it tastes too sharp, a tiny drizzle of honey softens it without making it sweet; if it tastes flat, a few grains of salt will wake it right up.

Tomato Selection and Timing

Buy tomatoes at the peak of their season—that window is short, which is exactly why this salad matters so much. An heirloom tomato in peak summer tastes nothing like one in February, and panzanella is honest enough that mediocre tomatoes won't hide. The right tomatoes need almost nothing except a little salt and that basil vinaigrette to taste like they've been cooked down for hours.

  • Choose at least two different varieties for color and varied flavor—deep reds taste earthier while yellows and oranges are sweeter.
  • Cut them just before assembling so they release as little liquid as possible, keeping your salad from turning into soup.
  • Room temperature tomatoes have more flavor than cold ones, so don't refrigerate them before using.
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Colorful sourdough panzanella salad with golden croutons, assorted heirloom tomatoes, and fresh basil vinaigrette for a light meal. Save to Pinterest
Colorful sourdough panzanella salad with golden croutons, assorted heirloom tomatoes, and fresh basil vinaigrette for a light meal. | frostkettle.com

This salad tastes like friendship and summer and the kind of simple meal that reminds you why cooking matters. Serve it when you want people to slow down and actually taste what's in front of them.

Recipe Questions & Answers

Can I use other bread types instead of sourdough?

Yes, rustic breads like ciabatta or country loaf are great alternatives that toast well and absorb the vinaigrette nicely.

How long should the salad rest before serving?

Let it stand for about 10 minutes to allow the bread to soak up the dressing and flavors to blend harmoniously.

What’s the best way to toast the bread cubes?

Toss the bread cubes with olive oil and sea salt, then bake at 180°C (350°F) until golden and crisp, about 10-15 minutes.

Can the basil vinaigrette be made ahead of time?

Yes, prepare the vinaigrette in advance and store it in the fridge for up to 2 days to help flavors develop.

What can I add for extra flavor or texture?

Consider adding capers, olives, or even a sprinkle of toasted nuts to enhance flavor and crunch.

Is there a dairy-free alternative to mozzarella or burrata?

For a dairy-free option, omit the cheese or use plant-based cheese alternatives to maintain richness.

Sourdough Panzanella Salad Heirloom

A vibrant mix of sourdough cubes, heirloom tomatoes, and basil vinaigrette for refreshing summer meals.

Prep Duration
20 minutes
Time to Cook
15 minutes
Overall Time
35 minutes
Created by Nora Whitman


Skill Level Easy

Cuisine Italian

Makes 4 Serving Size

Dietary Information Meatless

What You Need

Bread

01 8.8 ounces day-old sourdough bread, cut into 0.75-inch cubes
02 2 tablespoons extra-virgin olive oil
03 0.5 teaspoon sea salt

Vegetables

01 17.6 ounces assorted heirloom tomatoes, cut into wedges or bite-sized pieces
02 1 small cucumber, peeled and sliced
03 0.5 small red onion, thinly sliced
04 1 small garlic clove, minced

Basil Vinaigrette

01 1 cup fresh basil leaves, packed
02 0.25 cup extra-virgin olive oil
03 1.5 tablespoons red wine vinegar
04 1 teaspoon Dijon mustard
05 0.5 teaspoon honey
06 Salt and freshly ground black pepper to taste

Garnish

01 1.75 ounces fresh mozzarella or burrata, torn (optional)
02 Extra fresh basil leaves

How-To Steps

Step 01

Preheat and prepare: Preheat oven to 350°F.

Step 02

Toast bread cubes: Toss sourdough cubes with 2 tablespoons olive oil and 0.5 teaspoon sea salt. Spread on baking sheet and toast for 10-15 minutes, stirring once, until golden and crisp. Allow to cool completely.

Step 03

Prepare vinaigrette: In blender or food processor, combine basil, 0.25 cup olive oil, vinegar, mustard, honey, minced garlic, and pinch of salt and pepper. Blend until smooth. Taste and adjust seasoning as needed.

Step 04

Combine vegetables and bread: In large mixing bowl, combine tomatoes, cucumber, and red onion. Add cooled toasted sourdough cubes.

Step 05

Dress and rest: Drizzle basil vinaigrette over mixture and toss gently to coat evenly. Let stand for 10 minutes to allow flavors to meld and bread to absorb dressing.

Step 06

Serve: Transfer to serving platter. Top with mozzarella or burrata and extra basil leaves if using. Serve immediately.

Tools You'll Need

  • Large mixing bowl
  • Baking sheet
  • Blender or food processor
  • Chef's knife
  • Cutting board

Allergy Info

Review every ingredient for allergens. Ask a healthcare professional if unsure.
  • Contains gluten from sourdough bread
  • Contains milk from mozzarella and burrata cheese
  • May contain mustard from Dijon mustard

Nutrition Details (Each Serving)

Given for informational purposes, this isn't medical advice.
  • Energy Value: 330
  • Fats: 19 g
  • Carbohydrates: 32 g
  • Proteins: 8 g