SALAD: In a medium-sized bowl, combine the cucumbers, tomatoes, parsley, and red onion.
DRESSING: In a small bowl, stir together the lemon juice, oil, paprika, and salt and pepper to taste (I add 1/4 teaspoon salt and 1/8 teaspoon pepper). Whisk with a fork. Drizzle dressing over vegetables and stir to coat.