01 -
Heat oven to 350°F (175°C). Spread walnuts out on a baking sheet and toast, stirring once, for 6 to 8 minutes or until they turn golden. Let them cool, then chop roughly. Toss with a drizzle of olive oil and a little salt in a bowl.
02 -
Slice about 1 inch from the green tops and remove the roots of each leek. Cut them into rounds about half an inch thick. Rinse under cold water to clear out any dirt or sand.
03 -
In a large pot, boil salted water. Add leeks and cook until incredibly soft, roughly 12 to 15 minutes. Move them into an ice bath immediately, then let them drain and pat dry.
04 -
Mix vinegar, minced garlic, Dijon mustard, and whole-grain mustard in a small bowl. Add salt until it tastes right to you.
05 -
Place the leeks on a plate. Pour the dressing over them and leave them to absorb the flavors for at least 10 minutes. More time will make them tastier.
06 -
Right before eating, spread the prepared walnuts over the leeks and sprinkle with chopped tarragon and freshly cracked pepper.