04Whisk remaining 4 tablespoons oil, vinegar, Dijon mustard, and 1 tablespoon water into mustard-seed oil. Add potatoes and leeks; toss to coat. Season with salt and pepper. DO AHEAD: Can be made 1 day ahead. Cover; chill. Return to room temperature before serving, adding more oil and vinegar if dry.
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Not rich — missing servings, total time, or calories.