Here is the way I like to dice the Persian cucumbers-- it produces small, even, triangular pieces. Slice the Persian cucumber in half lengthwise.
Slice each half into 4 slices lengthwise, so you have 8 long, thin pieces total.
Cucumber sliced lengthwise into 8 pieces.
Hold the long, thin pieces together with one hand, and slice the bunch into very small pieces with the other hand. Note: Persian cucumbers have lots of little seeds, which add to their flavor. If you have trouble digesting seeds, you can seed the cucumber easily by slicing it in half lengthwise and scooping out the seed-filled center.
Place the diced cucumbers into a large mixing bowl along with all the other ingredients.
Chopped vegetables in a large mixing bowl.
Mix until vegetables are well coated with parsley, oil, lemon juice, and salt.