Poireaux Vinaigrette with Dijon, Egg, and Hazelnuts

Why You’ll Love This Recipe

• Classic French bistro flavors with a modern crunch: silky leeks, bright Dijon vinaigrette, jammy egg, and toasty hazelnuts.
• Elegant yet easy: simple techniques and pantry staples turn humble leeks into a dinner-party-worthy starter.
• Make-ahead friendly: cook leeks and eggs in advance, then assemble in minutes.
• Light, fresh, and satisfying—great as a starter, light lunch, or part of a spring spread.

Grocery List

• Produce: 6 leeks, 1 small shallot, 1 lemon, flat-leaf parsley, fresh chives
• Dairy: 2 large eggs
• Pantry: Hazelnuts, Dijon mustard, sherry vinegar, extra-virgin olive oil, honey, kosher salt, black pepper

Full Ingredients

Leeks

• 6 medium leeks (about 2 lb/900 g; white and light-green parts only)
• 2 qts (1.9 L) water + 1 tbsp kosher salt for boiling

Dijon Vinaigrette

• 2 tbsp Dijon mustard
• 2 tbsp sherry vinegar
• 1 tbsp fresh lemon juice
• 1 tsp honey
• 1 small shallot, very finely minced (about 2 tbsp)
• 1/2 tsp kosher salt, plus more to taste
• 1/4 tsp freshly ground black pepper
• 6 tbsp (90 ml) extra-virgin olive oil

Toppings & Garnish

• 2 large eggs
• 1/2 cup (70 g) hazelnuts, toasted and coarsely chopped
• 2 tbsp finely chopped flat-leaf parsley
• 1 tbsp finely chopped fresh chives
• Flaky sea salt and extra black pepper, to finish (optional)

Step-by-Step Instructions

Step 1: Toast the hazelnuts

Heat the oven to 350°F (175°C). Spread hazelnuts on a small sheet pan and toast for 8–10 minutes until fragrant and lightly darkened. Transfer to a clean kitchen towel and rub to remove most of the skins. Coarsely chop and set aside.

Step 2: Cook the eggs

Bring a small saucepan of water to a boil. Gently lower in the eggs and cook for 9 minutes for firm-yet-creamy centers. Transfer to an ice bath to stop cooking. Peel, then chop the eggs into small pieces (or finely grate for a “mimosa” texture). Set aside.

Step 3: Prep and clean the leeks

Trim off dark green leaves and most of the root, leaving the base intact so the layers hold together. Halve leeks lengthwise. Fan the layers under cool running water to rinse out any grit. Pat dry.

Step 4: Simmer the leeks

Bring 2 quarts (1.9 L) of water and 1 tablespoon kosher salt to a boil in a wide pot. Reduce to a gentle simmer, add leeks, and cook until very tender when pierced, 8–10 minutes depending on thickness. Transfer to an ice bath for 1–2 minutes to stop cooking, then drain well on a clean towel. Gently squeeze each leek to remove excess water.

Step 5: Make the Dijon vinaigrette

In a bowl, whisk together Dijon, sherry vinegar, lemon juice, honey, shallot, salt, and pepper. While whisking, slowly stream in the olive oil until emulsified and glossy. Taste and adjust seasoning—add a pinch more salt or vinegar for brightness as needed.

Step 6: Dress the warm leeks

While the leeks are still slightly warm, arrange them on a platter and spoon over about half of the vinaigrette, turning gently to coat. Let them rest for 5 minutes to absorb flavor.

Step 7: Finish and serve

Spoon the remaining vinaigrette over the leeks. Scatter the chopped egg, hazelnuts, parsley, and chives on top. Finish with a pinch of flaky sea salt and a few grinds of pepper. Serve slightly warm or at cool room temperature.

Pro Tips

• Choose slender, firm leeks for the most tender texture and quickest cooking.
• Keep the root end mostly intact so the leek halves don’t fall apart while simmering and dressing.
• Dry the leeks well and gently press out excess water; this prevents a watery plate and helps the vinaigrette cling.
• Dress while warm: warm leeks absorb vinaigrette better, delivering deeper flavor.
• For picture-perfect eggs, grate the yolks separately over the top just before serving for a “mimosa” finish.

Variations

• Smoked fish upgrade: Add flakes of hot-smoked trout or salmon for a more substantial lunch.
• Capers and tarragon: Add 1 tbsp chopped capers and 1 tsp minced tarragon to the vinaigrette for briny, aromatic lift.
• Nut swap: Try toasted almonds or walnuts if hazelnuts aren’t handy; both pair beautifully with Dijon.

Storage & Make-Ahead

Cooked leeks can be refrigerated (undressed) up to 2 days; pat dry before dressing. Vinaigrette keeps 1 week in the fridge—bring to room temp and whisk before using. Toasted nuts keep 1 week in an airtight container. Hard-cooked, peeled eggs keep 3 days chilled. Leftovers (dressed) are best within 24 hours; store covered and enjoy cold or at room temperature. Do not freeze.

Nutrition (per serving)

Approximate values (1 of 4 servings): 420 calories; 38 g fat; 7 g protein; 24 g carbohydrates; 5 g fiber; 360 mg sodium (varies with added salt).