Leeks in Vinaigrette

Leeks are a quintessentially French vegetable. Because they’re a mainstay in the French diet, you can find them at just about any marché in France year-round, but they are especially wonderful in the autumn, when a new crop of small, sweet specimens makes an appearance. While most homes have their own variation of poireaux vinaigrette, or leeks in vinaigrette, the leeks are almost always boiled, and the vinaigrette usually has mustard in it. We top ours with pickled mustard se