Charred Leek Yogurt Sandwich with Lemon and Herbs

Jump to Recipe

Leeks get overlooked compared to onions, but char them until the outer layers are blackened and the insides turn silky-sweet, and they become the most interesting thing on the plate.

This sandwich layers those smoky, tender leeks onto thick-spread strained yogurt, then finishes with lemon zest, fresh dill, and a drizzle of olive oil. It eats like a full meal without being heavy.

The technique is straightforward: a dry cast iron pan or a hot grill does the charring work in about 15 minutes. The yogurt spread comes together while the leeks cool, so the whole thing is on the table in 40 minutes.

It works as a quick lunch, a light dinner, or something to prep ahead and assemble through the week, much like a herbed chickpea salad sandwich.

Why You’ll Love This Recipe

• Charring builds deep smoky sweetness with almost no effort
• Strained yogurt spread is tangy, thick, and protein-rich
• Leeks can be charred ahead and refrigerated for three days
• One pan, minimal cleanup, ready in 40 minutes

Ingredient Notes

• leeks: Use large leeks with firm white and light-green parts. Trim the dark green tops but save them for stock. Baby leeks also work well and char faster.
• strained yogurt: Greek yogurt works, but Labneh is thicker and holds better in the sandwich. If using regular plain yogurt, drain it through a cheesecloth for 30 minutes first.
• sourdough bread: A sturdy, slightly open-crumbed loaf holds the yogurt without going soggy. Ciabatta or a thick country loaf are good alternatives.
• fresh dill: Dill pairs well with the smoky leek and tangy yogurt. Flat-leaf parsley or chives work if you don’t have dill on hand.
• lemon: You need both zest and juice. The zest goes into the yogurt, the juice brightens the leeks after charring. Don’t skip either step.
• garlic: One raw clove grated into the yogurt is enough. If raw garlic is too sharp for you, use half a clove or rub the bread with a cut clove instead.
• olive oil: Use a good-quality extra-virgin oil for finishing. A fruity or slightly peppery variety works well with the charred flavor.

Charred Leek Yogurt Sandwich with Lemon and Herbs

Smoky charred leeks piled onto garlicky strained yogurt and crusty bread, finished with lemon, dill, and olive oil. A satisfying vegetarian sandwich ready in 40 minutes.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 25 minutes mins

Total Time 40 minutes mins

Servings: 4 servings

Calories: 420

Ingredients Method Notes

Ingredients

  

Charred Leeks

• 4 large leeks white and light-green parts only, halved lengthwise
• 1 tbsp olive oil for finishing, not for charring
• 1 lemon juice only, squeezed over leeks after charring
• 1/2 tsp flaky sea salt
• 1/4 tsp black pepper freshly ground

Yogurt Spread

• 300 g strained Greek yogurt or labneh full-fat
• 1 clove garlic finely grated
• 1 tsp lemon zest from the lemon used for the leeks
• 1 tbsp olive oil
• 1/2 tsp salt

To Assemble

• 8 slices sourdough bread about 1.5 cm thick
• 15 g fresh dill roughly chopped
• 10 g fresh flat-leaf parsley roughly chopped
• 2 tbsp extra-virgin olive oil for drizzling
• 1/4 tsp red pepper flakes optional
• 4 lemon wedges for serving

Method

 

Char the Leeks

1. Heat a large cast iron skillet over high heat for 2 minutes until very hot. Do not add oil.
2. Place the halved leeks cut-side down in the dry pan. Cook undisturbed for 4 to 5 minutes until the cut face is deeply blackened and the edges are charred.
3. Flip the leeks and char the rounded side for another 4 to 5 minutes. The outer layers should be blackened and the leeks should feel tender when pressed.
4. Transfer the leeks to a cutting board and let them cool for 5 minutes. Peel off and discard the charred outer layers to reveal the soft, sweet interior.
5. Squeeze lemon juice over the leeks while still warm, drizzle with 1 tbsp olive oil, and season with flaky salt and black pepper. Set aside.

Make the Yogurt Spread

1. Combine the strained yogurt, grated garlic, lemon zest, olive oil, and salt in a small bowl.
2. Stir well and taste. Adjust salt if needed. Let the spread rest for at least 5 minutes so the garlic mellows slightly.

Toast the Bread

1. Place the bread slices cut-side down in the same cast iron pan over medium heat. Toast for 60 to 90 seconds until golden and lightly crisped on one side. Work in batches if needed.

Assemble the Sandwiches

1. Spread a generous layer of yogurt, about 3 to 4 tbsp, onto each of the toasted bread slices.
2. Lay the charred leek halves over the yogurt on 4 of the slices. Scatter dill and parsley over the leeks.
3. Drizzle with extra-virgin olive oil and add a pinch of red pepper flakes if using.
4. Press the second yogurt-spread slice on top or serve open-face. Serve immediately with lemon wedges on the side.

Notes

Nutrition is estimated per assembled sandwich using full-fat Greek yogurt and sourdough. Values will vary depending on bread thickness and how much olive oil you drizzle at serving.

Tips for Success

• Dry-char the leeks in a cast iron pan with no oil for deeper, more even blackening on all sides.
• Peel off the outermost charred layer after cooking to reveal the silky, sweet interior beneath.
• Salt the yogurt spread 10 minutes before assembling so it seasons evenly throughout.
• Toast the bread cut-side down in the residual pan heat for 90 seconds to add crunch without drying it out.
• Squeeze lemon juice over the leeks while they are still warm so the acid absorbs into the flesh.

Variations

• Add a smear of harissa under the yogurt for a smoky, mildly spicy contrast to the sweet leeks.
• Top with a soft-boiled egg, halved, for extra protein and a richer, more filling sandwich.
• Use flatbread instead of sourdough and fold it over the filling for a handheld wrap format.

Storage and Reheating

Charred leeks keep well. Store them in an airtight container in the fridge for up to 3 days. The yogurt spread will hold for 4 days covered in the fridge.

Keep the components separate until you’re ready to eat. Assembled sandwiches go soggy within a couple of hours, so build them fresh each time.

To reheat the leeks, warm them in a dry skillet over medium heat for 2 to 3 minutes, or eat them at room temperature, which is how I prefer them in warmer months.

Serving Suggestions

This sandwich is filling on its own, but a simple green salad dressed with lemon and olive oil — or a bright lemon herb bowl — rounds out the meal without competing with the smoky leek flavor.

A small bowl of marinated olives or pickled cucumbers alongside adds a briny contrast that cuts through the richness of the yogurt. Both are easy to prep ahead.

For a spread lunch or light dinner with guests, cut the sandwiches into thirds and serve them open-face on a wooden board with extra herbs scattered on top.

FAQ

Why are my charred leeks mushy instead of holding their shape?

Mushy leeks usually mean they were too wet going into the pan or the heat wasn’t high enough. Pat the leeks dry before charring and make sure your cast iron is fully preheated. The outside should sear and blacken before the inside softens.

Can I use labneh instead of Greek yogurt in this sandwich?

Yes, labneh is actually a better choice here. It’s thicker and less watery, so it stays put on the bread and doesn’t make things soggy. Use the same quantity, straight from the container.

Can I char the leeks on an outdoor grill instead of a stovetop pan?

A grill works well and adds a light smokiness you can’t fully replicate on a stovetop. Place whole leeks directly on the grate over medium-high heat and turn every 3 to 4 minutes until charred on all sides.

What bread works best for a charred leek yogurt sandwich without falling apart?

A dense, chewy loaf like sourdough or country bread holds up best. Avoid sandwich bread or anything with a very soft crumb, as the yogurt will soak through quickly.

Is this charred leek sandwich gluten free?

Not as written, since it uses sourdough. To make it gluten free, use a sturdy gluten-free loaf or serve the charred leeks and yogurt on rice cakes or gluten-free flatbread. All the other components are naturally gluten free.

What’s the difference between a charred leek sandwich and a caramelized onion sandwich?

The technique and texture are different. Charred leeks cook quickly over high dry heat and keep a slightly fibrous, layered bite with a bitter-edged char. Caramelized onions cook low and slow in fat until uniformly soft and sweet, with none of that smoky contrast.