- 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.