In a medium bowl, combine vinegar and shallot, and let stand at least 15 minutes.
In a small bowl, whisk together mayonnaise, mustard, and egg yolks until smooth. Add yolk mixture to shallot mixture, whisking to combine. Add chives, dill, sugar, salt, and peppers, whisking to combine. Whisking constantly, gradually add olive oil until combined. Whisk until smooth. Cover, and refrigerate for at least 2 hours. Store covered in refrigerator up to 3 days.
Recipe by Louisiana Cookin' at https://louisianacookin.com/spring-vegetables-deviled-egg-vinaigrette/