Place the diced cucumber in a salad bowl. Remove the stems from the arugula. Tear the leaves into bite sized pieces. Add arugula to cucumber. In a cup, stir together the lemon juice, sugar, oil, chives, salt and pepper. Pour over the cucumbers and toss well. Set aside for 5 minutes for the flavors to blend. Spoon onto 2 salad plates. Makes 2 servings