Step 1 In a small bowl, combine the vinegar, shallots and salt; set aside for 20 minutes to soften the shallot. Slowly drizzle in the oils while whisking to emulsify the vinaigrette. Whisk in the chervil and pepper. This makes a scant one-half cup vinaigrette; the vinaigrette will keep, covered and refrigerated, up to 4 days.