This refreshing Watercress and Cucumber Salad with a simple dressing is ready in 10 minutes. It makes for a delicious side dish.
In a large bowl, whisk together oil, vinegar, and mustard; season with salt and pepper. Add watercress and cucumber; toss to combine. Serve immediately.
Although watercress stems are edible, the bottom two inches are usually too tough for salad. Trim them off with a sharp knife, and discard.