Cook orzo to al dente, according to package instructions. Rinse well with cold water.
While pasta cooks, prepare vinaigrette. In a medium bowl, add all 9 vinaigrette ingredients and whisk well. Store in fridge until ready to use.
Slice cucumbers into half-moons, halve tomatoes, dice bell pepper, dice red onion, halve kalamata olives, crumble feta and chop fresh parsley.
Once orzo has cooled (place in freezer for a bit if needed), transfer to a large mixing bowl. Add chopped veggies, sliced olives, crumbled feta cheese and ¼ cup chopped parsley.
Pour the vinaigrette over the top and mix well using tongs or a big spoon. Top with the zest and juice from 1/2 lemon.
Chill until ready to serve. Garnish with more feta crumbles and serve with extra lemon slices (optional).