- 2 teaspoons white-wine vinegar
- 2 teaspoons Dijon mustard
- 1/2 teaspoon salt, or to taste
- 1 1/2 teaspoons sugar
- 1 tablespoon mild olive oil
- 1 large seedless cucumber (usually plastic-wrapped; 1 lb), peeled
- 2 tablespoons chopped fresh dill
- Whisk together vinegar, mustard, salt, and sugar in a bowl, then add oil in a slow stream, whisking.
- Halve cucumber lengthwise and remove seeds with a small spoon, then cut halves crosswise into 1/8-inch-thick slices.
- Add cucumber and dill to vinaigrette, tossing to coat.