In a large salad bowl, add the onion and the juice of ½ a lemon. Mix well and set aside for 5 minutes while you prep the rest of the ingredients. The lemon juice will help 'cook' some of the strong flavor of the raw onion.
After 5 minutes, add the artichokes, tomatoes, olives, garbanzo beans, parsley and 2-3 tablespoons of dressing. Mix well.
Add the arugula and toss until all ingredients get evenly distributed in between the arugula.
Serve with more dressing on the side.
