Ingredients
1 teaspoon grainy mustard
1 tablespoon red-wine vinegar
1 tablespoon olive oil
Coarse salt and ground pepper
1 head Boston lettuce torn, into bite-size pieces
1/2 English cucumber, halved lengthwise and thinly sliced
Preparation
In a large bowl, whisk together mustard and vinegar; whisk in oil until blended. Season dressing with salt and pepper.
Add lettuce and cucumber to bowl; toss to coat with dressing. Serve salad immediately.