Leek Vinaigrette with Soft-Boiled Egg
Why this recipe works
- Sharp, balanced dressing: Dijon mustard helps the vinaigrette emulsify while white wine vinegar cuts through the natural sweetness of the leeks and richness of the egg.
- Tender with bite: Gently simmered leeks stay soft but intact, while capers add small bursts of briny texture.
- Simple timing: The leeks and eggs cook in the same saucepan, keeping the method efficient and the total time comfortably short.
Get the most out of this recipe
Timing notes
- Serve cool or barely warm: The leeks are best once they have cooled enough to absorb the vinaigrette without wilting further.
- Eggs are best fresh: Cook the eggs close to serving if possible, especially if you want soft centres and a clean finish.
Ingredient notes
- Rinse the leeks thoroughly: Split the leeks lengthways and wash between the layers, as grit often hides near the pale green sections.
- Use a good Dijon: Dijon mustard is central to the dressing, giving it body, mild heat and a classic French flavour.
- Adjust the sharpness: If the vinaigrette tastes too assertive, add a little more olive oil; if it tastes flat, add a touch more vinegar.
Make-ahead tips
- Keep components separate: Store the cooked leeks and vinaigrette separately, then dress the leeks shortly before serving for the cleanest texture.
- Prepare the leeks ahead: The leeks can be cooked in advance and brought back towards cool room temperature before dressing.
Authenticity notes
- French home-style starter: Poireaux vinaigrette is a simple French vegetable dish often served as a starter, usually focused on tender leeks and a mustardy vinaigrette.
- Egg makes it more substantial: Adding soft-boiled egg is a common way to turn the dish from a light starter into a fuller lunch.
Equipment you'll need
Ingredients
Instructions
- Trim the leeks, keeping the white and pale green parts, then split them lengthways and rinse well to remove any grit. Bring a saucepan of water to the boil and season it with half the fine sea salt.
- Add the leeks and simmer gently for 10 to 12 minutes until just tender when pierced with a knife. Lift out carefully and drain in a colander, then leave to cool until barely warm.
- Meanwhile, return the water to a steady boil and lower in the eggs. Boil for 6 minutes for soft centres, then drain and cool under cold running water until you can handle them.
- In a mixing bowl, whisk together the Dijon mustard, white wine vinegar, remaining fine sea salt and black pepper. Whisk in the extra virgin olive oil until emulsified, then stir in the capers and finely chopped fresh parsley.
- Arrange the cooled leeks on plates and spoon over the vinaigrette, turning gently so they are well coated. Peel the eggs, halve them, and place on top; finish with any remaining capers and parsley from the bowl.
Recipe notes
Tips
- For the cleanest soft-boiled eggs, use eggs straight from the fridge and start timing as soon as they hit the boiling water.
- If the leeks are very thick, simmer them a few minutes longer, but keep the heat gentle so they do not break apart.
- Eggs should be cooked until the whites are set; if serving to pregnant people, young children, or anyone vulnerable, use eggs with the British Lion mark or cook the eggs until the yolks are firm.
Substitutions
- Replace White wine vinegar with Apple cider vinegar for a slightly fruitier acidity.
- Replace Fresh parsley with Fresh dill for a softer, more aromatic finish.
- Replace Capers with Pickle relish for a similar briny bite.
Storage
- Refrigerate up to 2 days
- Store the leeks and vinaigrette separately in the fridge, then bring to cool room temperature before serving. Cook the eggs fresh if you can; if storing, keep peeled eggs chilled and eat within 1 day.
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Recipe overview
- Servings: 2 servings
- Total time: 30min (20min active)
- Difficulty: Easy
- Cuisine: French
-
Allergens:
Eggs Mustard
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